It's a long time since I had looked for an intermediate Fed 1f, between the first series (with 1/20th and Z, and a Leica type shutter release) and the second one (1/25th and B, and a "bowl" shutter).
It seems I got it:
http://www.ussrphoto.com/UserContent/2832017_DSCF2606.JPG
The 8 speeds are present. So, it is the good dial for the first series. And the "bowl" release denotes the second one. The s/n is correct for a "cross over" camera.
Yes, I know,I am completely mad with these cameras!
Amitiés. Jacques.
