Identify this 50 pin connector
That's a made-up adapter, that swaps the even and odd wires of
a 50-position ribbon cable.   Note that the one side's polarizing
notch is on the lower pins, and the other side-s polarizing nub
is adjacent to the upper pins.  That's a wiring no-no, it won't
connect pin 1 to pin 1.

A real ribbon cable coupler would have latches to secure the cables,
and provision for connecting to a chassis, not just bare conductors.

Probably, the less-visible side just has the ends of wire-wrap pins
poking through a mismatched plastic shell part.

Couplers for two-row SCSI feedthrough (male/female) only used back-to-back connectors in conjunction
with a U-shaped flexible wiring board (and usually contained
terminator resistors).   The wiring board did the top/bottom swap
so pin 1 side A DID connect to pin 1 side B.