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"GM 40 3-speed manual transmission" - decoding / help needed


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Hello everybody and greetings from Austria, 

I am new to this forum.

I picked-up a 3 speed manual transmissions from a friend of mine, who had it left over from his father, who unfortunately passed away last week. 
I plan to bolt the transmission into one of my vintage cars with adaptions.

It might be a Chevrolet / Camaro transmission from the 1970s or early 80s. Could be a "European" version. Not sure if there where different transmissions used for Europe.


Numbers on the transmission housing are: GM 40 8925647
I am attaching a couple of photos of the transmission. 

Could you please help me with decoding to clarify which transmission I do have on my bench now. 
I will need a speedometer gear (it´s missing) and maybe some other parts.

Thank you for your help, 









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