Description1973 Seamaster 813 — For Sale

A beautifully presented, well-equipped classic river cruiser ready for her next adventure

Currently based on the Upper Thames

A much-loved and characterful 1973 Seamaster 813, combining classic British boat-building charm with a thoughtful range of modern upgrades. She has been carefully maintained and enhanced over the years, including a recently fitted diesel heating system, new batteries, renewed seacock and regular engine servicing.
With her comfortable accommodation, practical galley, spacious cockpit and excellent handling equipment, she is ideally suited to relaxed cruising and extended weekends afloat.


Specification Details
Year: 1973
Length: 8.13 m
Beam: 2.77 m
Draft: 0.69 m
Engine: BMC 1.5 L diesel, shaft drive
Fuel: Diesel
BSSC valid until 15/05/2027
Location: Thames

Engine:
The dependable BMC 1.5 L diesel on shaft starts faultlessly on the turn of the key and has been maintained with regular attention.

- Twice-yearly oil changes
- Oil and diesel filters changed April 2026
- Belt last changed March 2025
- New impeller March 2025
- Reconditioned diesel injector pump
- Reconditioned injectors December 2024
- 2 × new batteries fitted February 2026
- 1 × engine
- 1 × leisure
- NASA battery monitoring
- The boat was last out of the water in June 2026, when the seacock was replaced.
- Last antifouled: March 2025

Cruising & Exterior Features:

- She is particularly well equipped for comfortable cruising and easy handling.
- Bow thruster
- Rudder extension for improved handling
- Radar arch
- Bespoke bathing platform
- Davits suitable for a tender — or even a hammock!
- Bailey & Stone canopy in excellent condition
- Side and rear canopy window covers
- Winter cabin cover
- Fly screens for side cabin windows

The bespoke bathing platform and davits add considerable practicality, while the bow thruster and rudder extension make manoeuvring considerably easier.

New Diesel Heating — April 2026
For comfortable cruising throughout the season, the boat has a newly fitted diesel heater, installed in April 2026.
The saloon has a hot-air heating outlet and remote control, making it easy to warm the cabin before settling in for the evening.

Cockpit:

A particularly attractive feature is the beautifully finished cockpit, combining traditional character with practical modern touches.

- Stunning solid teak dashboard
- Bespoke and original seating
- New flooring with wood-effect finish and aluminium edging
- Woodwork oiled rather than varnished, retaining a warm and natural appearance

It's an inviting space for relaxed cruising, entertaining or simply enjoying an afternoon on the river.

Saloon & Galley:

The interior has a wonderfully traditional feel while offering plenty of equipment for comfortable weekends aboard.

Saloon:

- LED lighting
- Handmade curtains
- Original bench cushions
- Alternatively, a bespoke double mattress made especially for Two Free Spirits by Ted's Beds
- Side sliding windows
- Bespoke fly nets
- Hot-air heating outlet and remote control

Galley:

- 12V fridge
- Plastimo Neptune 2000 two-burner gas hob
- Grill and oven
- Microwave for use on shore power

Front Cabin:

A cosy and versatile forward cabin offering:

- Handmade curtains
- V-berth converting to a double berth
- Side sliding windows
- Bespoke fly nets

Heads:

- Original basin
- Porta Potti

A Classic Boat with Practical Modern Upgrades

This Seamaster 813 offers the appeal of a classic British cruiser while benefiting from a significant programme of recent maintenance and improvements.
From the new diesel heater and batteries in 2026, to the recent injector work, impeller and belt, and the June 2026 lift-out and seacock replacement, considerable attention has been given to keeping her ready for cruising.
She has the equipment and accommodation to make a wonderful weekend escape, leisurely river cruiser or extended summer liveaboard, while retaining the charm and character that make classic Seamaster boats so appealing.

1973 Seamaster 813
8.13 m • BMC 1.5 Diesel • Shaft Drive • Bow Thruster • Diesel Heating • BSSC to May 2027

Currently based on the Upper Thames.

Viewing strictly by appointment only. Please call the office on 01235 536147 or email abingdonmarina@gmail.com to book an appointment.