Saving Old Seagulls

Hello Charlesp,
The magneto flywheel reads the number JM 7340
The baseplate reads 2 numbers underneath where normaly the light coils are: 1120X1 and 1705
The gearbox has the Navy mark stamped.
Does anyone has a picture of the locking lid for the tail?
The crankshaft has two extra counterbalance ...

Thanks for the responce gentleman,
Is there any number on the carb?

I started the restoration of the SD Seagull.
Just a picture.

Hello Seagull friends,
I am restoring a SD type Seagull with the number SD.3822.L.3
I like to hear from other members what parts are non original.
For sure the carburettor isn’t, this one is a Mikuni, I think the original must be an Amal.
Can anyone post some detailed pictures of an original one, or ...