• Slide: The Image of 1984 Duffy 20 Hardtop Diesel boat docked in a marina. - 1The Image of 1984 Duffy 20 Hardtop Diesel boat docked in a marina. - 1
  • Slide: The Image of 1984 Duffy 20 Hardtop Diesel boat with wooden cabin docked at marina. - 2The Image of 1984 Duffy 20 Hardtop Diesel boat with wooden cabin docked at marina. - 2
  • Slide: The Image of Bow of 1984 Duffy 20 Hardtop Diesel boat docked in green water. - 3The Image of Bow of 1984 Duffy 20 Hardtop Diesel boat docked in green water. - 3
  • Slide: The Image of Interior of a 1984 Duffy 20 Hardtop Diesel boat with wooden helm and seating. - 4The Image of Interior of a 1984 Duffy 20 Hardtop Diesel boat with wooden helm and seating. - 4
  • Slide: The Image of 1984 Duffy 20 Hardtop Diesel boat docked, interior view with steering wheel and seating. - 5The Image of 1984 Duffy 20 Hardtop Diesel boat docked, interior view with steering wheel and seating. - 5
  • Slide: The Image of 1984 Duffy 20 Hardtop Diesel boat with white seating and wooden interior. - 6The Image of 1984 Duffy 20 Hardtop Diesel boat with white seating and wooden interior. - 6
  • Slide: The Image of 1984 Duffy 20 Hardtop Diesel engine compartment with visible components. - 7The Image of 1984 Duffy 20 Hardtop Diesel engine compartment with visible components. - 7
  • Slide: The Image of 1984 Duffy 20 Hardtop Diesel boat with white seating and wooden helm. - 8The Image of 1984 Duffy 20 Hardtop Diesel boat with white seating and wooden helm. - 8
  • Slide: The Image of 1984 Duffy 20 Hardtop Diesel boat interior with white seating and wooden helm. - 9The Image of 1984 Duffy 20 Hardtop Diesel boat interior with white seating and wooden helm. - 9
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1984 Duffy 20 Hardtop Diesel

$19,500

Used

Boat in Newport Beach, CA 92663 US

builtBuilt in 1984
Year the boat was built
model

20 Hardtop Diesel

Boat model
engine

1 Engine (Yanmar)

Engine type and count
length

20 feet

Overall boat length
fuel

Diesel

Fuel type
material

Fiberglass/Reinforced

Hull material

1984 Duffy 20 Hardtop Diesel- Refit & Ready


This charming Duffy 20 Hardtop offers timeless elegance with the benefits of a modern upgrade. Powered by a unique Yanmar diesel engine, this vessel has undergone a $20,000 professional refit by South Coast Shipyard in Newport Beach.


Highlights:

• Yanmar diesel engine- rare and efficient

• Stunning etched glass hardtop for added character and shade

• $20,000 in recent upgrades, including:

• Fresh bottom paint

• New shaft seals

• Full LP paint on hull and interior

• Brand new seating

• Refinished brightwork & varnish


This boat is a head turner in the harbor and a joy to cruise. Whether you're looking for a classy electric alternative, a harbor cocktail cruiser, or a standout rental fleet addition, this Duffy is ready to impress.


For serious inquiries, please contact Mark directly at 949-548-9999


All inquiries must include a phone number for a response

Nominal Length
20ft
Length Overall
20ft
Beam
8ft
Cruising Speed
8kn
Max Speed
10kn
Range
50nmi
Seating Capacity
12
Fuel Tanks
20gal
Electrical Circuit
12v
Hull Material
fiberglass
Hull Shape
displacement
Engine 1
Engine Make
Yanmar
Engine Model
2GM20 F
Total Power
30hp
Engine Type
inboard
Fuel Type
diesel
Engine Year
2008
Drive Type
direct
Propeller Type
3-blade
Propeller Material
bronze
Cockpit Cushions
✓
Compass
✓
Disclaimer

The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

Price History

DateEventPrice
12/2/25Price decreased$19,500(-20.4%)
7/8/25Price decreased$24,500(-15.5%)
6/28/25Initial price$29,000

Overview from around the web 1984 Duffy 20 Hardtop Diesel

The 1984 Duffy 20 Hardtop Diesel has garnered a positive reputation among boat enthusiasts and owners alike

Here’s what customers are saying about this classic vessel: 1. Reliability: Many owners appreciate the dependable diesel engine, highlighting its fuel efficiency and longevity. The Duffy 20 Hardtop Diesel is often praised for its ability to handle various water conditions with ease. 2. Comfortable Space: The spacious interior, complete with a hardtop for protection from the elements, is frequently mentioned. Customers love the ample seating and the overall layout, which makes it perfect for socializing or relaxing on the water. 3. Classic Design: The timeless design of the Duffy 20 is often noted, with many owners expressing admiration for its classic lines and charming aesthetics. This boat appeals to those who appreciate vintage craftsmanship. 4. Ease of Use: Many users highlight how easy it is to operate, making it a great choice for both novice and experienced boaters. The handling is often described as smooth and manageable, contributing to a pleasant boating experience. 5. Maintenance: Owners often comment on the ease of maintenance for the diesel engine, which can be less demanding than gasoline alternatives. This aspect is appreciated by those looking to minimize upkeep while maximizing enjoyment on the water. 6. Versatility: The Duffy 20 Hardtop Diesel is noted for its versatility, serving well for leisurely cruises, fishing trips, or simply enjoying a day on the water with family and friends. Overall, the 1984 Duffy 20 Hardtop Diesel continues to be a beloved choice for those seeking a reliable, comfortable, and stylish boating experience.

Made For

The 1984 Duffy 20 Hardtop Diesel is an ideal choice for boaters seeking a versatile and reliable vessel for both leisurely outings and practical use. Its compact size makes it perfect for families or small groups looking to enjoy a day on the water, whether it be for fishing, entertaining, or simply cruising along the coastline. With its hardtop design, this model offers protection from the elements, making it suitable for year-round boating. The diesel engine provides excellent fuel efficiency and reliability, appealing to those who prioritize long-lasting performance and lower operational costs. Additionally, the Duffy 20 Hardtop is perfect for those who appreciate classic craftsmanship combined with modern amenities. It caters to boaters who value stability and comfort, featuring ample seating and a well-designed layout for both relaxation and activities on board. Whether you're a seasoned boater or a newcomer to the maritime world, the Duffy 20 Hardtop Diesel is designed to enhance your boating experience, making it a perfect fit for a variety of lifestyles and preferences on the water.

Finance your dream boat!

Use our boat payment calculator to estimate monthly payments for 1984 Duffy 20 Hardtop Diesel. Enter your down payment, choose a loan term, and adjust the interest rate to see an instant payment estimate — ideal if you're calculating boat payments before you enquire. Wondering how much does a Bay cost in today's market, or how much does a Duffy cost for similar models? This boat financing calculator helps you compare scenarios in seconds, whether you're considering used boat financing or a new purchase.
Monthly payment
$221.32/mo
$
$
Loan amount$ 19,500
OR
%

Finance your dream boat!

Use our boat payment calculator to estimate monthly payments for 1984 Duffy 20 Hardtop Diesel. Enter your down payment, choose a loan term, and adjust the interest rate to see an instant payment estimate — ideal if you're calculating boat payments before you enquire. Wondering how much does a Bay cost in today's market, or how much does a Duffy cost for similar models? This boat financing calculator helps you compare scenarios in seconds, whether you're considering used boat financing or a new purchase.
Monthly payment
$221.32/mo
$
$
Loan amount$ 19,500
OR
%

Contact Allied Yacht & Ship LLC

226 21st Street, Newport Beach, CA, 92663

By checking this box, I consent to receive recurring marketing text messages, phone calls, and emails from Allied Yacht & Ship LLC at the number and email provided, including messages sent using an autodialer or prerecorded voice. Message frequency varies. Message and data rates may apply. Reply STOP to opt out or HELP for assistance. Consent is not a condition of purchase. We'll also send helpful email updates about your boat search. You can unsubscribe whenever you like. See Terms of Use and Privacy Policy.

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Meet the Broker

Address

226 21st Street
Newport Beach, CA 92663

Boat Location

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Contact Allied Yacht & Ship LLC about 1984 Duffy 20 Hardtop Diesel

226 21st Street, Newport Beach, CA, 92663

By checking this box, I consent to receive recurring marketing text messages, phone calls, and emails from Allied Yacht & Ship LLC at the number and email provided, including messages sent using an autodialer or prerecorded voice. Message frequency varies. Message and data rates may apply. Reply STOP to opt out or HELP for assistance. Consent is not a condition of purchase. We'll also send helpful email updates about your boat search. You can unsubscribe whenever you like. See Terms of Use and Privacy Policy.

Contact Allied Yacht & Ship LLC

226 21st Street, Newport Beach, CA, 92663

By checking this box, I consent to receive recurring marketing text messages, phone calls, and emails from Allied Yacht & Ship LLC at the number and email provided, including messages sent using an autodialer or prerecorded voice. Message frequency varies. Message and data rates may apply. Reply STOP to opt out or HELP for assistance. Consent is not a condition of purchase. We'll also send helpful email updates about your boat search. You can unsubscribe whenever you like. See Terms of Use and Privacy Policy.

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