could be an IBM interace card
Definitely
NOT an IBM interface card for four reasons:
1. No IBM card soldered to gold tabs.
2. Prior to the early 1908's, IBM used their own part numbering schemes of everything, including discrete semiconductors.
3. Workmanship is generally poor. Wire-adds were never placed in such a haphazard way on IBM cards and there is no bevelling on the card connector edge.
4. ALL IBM PCBAs and PCBs have the part numbers and usually the EC number on them as well.
I worked for IBM for many years on a very wide range of equipment made from 1926 (ICT) until 1999, covering a broad range of technologies, from valves (vacuum tubes) right through to advanced VLSI. That includes IBM's SLT boards which are vaguely similar to the board shown here.
It looks like a board out of an old adding machine, early impact printer or OEM tape drive. In any case, EMC was never a consideration!