This is a British Seagull
SD 102, from 1942.
The SD 102 was manufactured 1942 to 1945.
As far as anyone is aware the wartime 102 was not used in the D-Day landings, and the information of what they actually were used for is sketchy at best.
The war time motors have a coolie-hat flywheel, the cover can be copper or aluminium.
It also has a wartime stamp on the skeg and has more bronze and brass fitting not seen on later 102's.
Villiers ignition system for the early 102
This ignition setup, is pretty common in the 40's and is seen on others engines of this era.
This is the 102 as I got it, other than some missing parts it's in pretty good condition.
It has been covered in more and more lacquer over the years, which is one thing that British Seagull told you to do, as it kept the rust away, the drive tube always rusts, as the plating was never very good to start with.
After some time polishing, buffing and painting, it’s finished.
I replaced the prop, sent the drive tube off and had it re-plated, luckily I had a spare tank cap which are getting hard to find.
The bronze transom bracket is not original to the motor, this probably would have had a heavy angle iron transom bracket that fitted to the side of the boat, so most were thrown away and replaced with more user friendly ones, the bronze one looks more in keeping with this wartime motor.
On this SD model, the studs that hold the cylinder block are on the crank case, later model 102's will have the studs in the cylinder block, not the crank case.
This has the copper flywheel cover, aluminium tank mounts, brass air intake trumpet.
The gearbox with the wartime stamp on the skeg, the older 102's have grease nipples rather than a filler plug on the front cap, this type gearbox used heavier weight oil than the later models, parts varied over the years on most if not all British seagulls, so it may not always be what it makes out to be.
The predecessor to the 102 was the Marston, the early ones had a teardrop exhaust and the later ones look similar to a normal 102’s, but with a finned cylinder head.
I think the teardrop version is a beautiful motor and no I don’t own one, they can be fragile and early parts are very thin on the ground.