What is this?

[Jan Thor]

Are there anyone who can id this one?

[AFJ]

Are there anyone who can id this one?

Is there a serial number stamped into the top of the g/box case and in the case cover? If so what is that combination of letters and numbers?
What are the thread form and thread pitch of the studs and cover screws?

AFJ

[Jan Thor]

There is a nr. 8307X3 on the case. Treads are 5/8" UNF and 3/8" UNC. I think it is British, but it can be American also. It is mounted on top of the frame with the bolts down if you understand me. Jan

[Petrol]

Not sure what the gearbox is, but looking through the wonderful long thread with old pictures on this forum I see this photo, and that looks intriguing...

[Jan Thor]

Close, but I don't think this is the same