I cannot find any markings, but this was sold as Märklin and sure looks to be...

the stanchions do look Märklin to me.
the stanchions do look Märklin to me.
Agreed, both paint and style. Would have liked them to have had the cast "M" included like other pieces...
Pulleys also match other Märklin pieces here

Nice little Märklin "gearbox" Nick, congrats !
I can find it all the way through the 30´s in the catalogues, but see no trace of it post WW2 in my meager Märklin database here.
Here it is in the 1937 catalogue:
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Thank you for posting that Jan!
Jan's catalog posting above translated to "transmission gearbox, solid cast iron frame, drawn shaft, two grooveed wheels"