Looks like the schräg (slant) Merkur 38 with the lange Verschraubung (long screw connection) - not in the photo.View attachment 1919626
Yes, definitely the 38, you know your Merkurs!
Here's one I don't use. (640.38 on shipper)
Looks like the schräg (slant) Merkur 38 with the lange Verschraubung (long screw connection) - not in the photo.View attachment 1919626