Looks like three rows of approx.36 pins, so it's likely a EuroDIN Connector for a Daughtercard, or maybe that's how their interconnect system worked, but you'd expect to see a female on one side and a male connector on the other. =8-/
Dunno, could be for a ribbon cable/flex circuit daisy chain connection . . . :?:
I feel your pain, comrade, I was a new father, running a business on a shoestring back in the day. My two largest purchases ever were for a Radius Rocket 33 and 32 MB of PC SIMMs to fill it . . .
. . . when memory prices were at their peak, no less! :
Then again, If I'd had money, I wouldn't know beans about pushing the Old Iron and Peripherals for all they're worth . . . or have a bunch of Documentation from Apple Press, ads/specs and magazine articles stored away for all the stuff I lusted after, but could never afford as research materials! [
] ]'>It's a good thing everybody gave me cameras, lenses and Japanese Pull Saws as presents, cuz nobody could have afforded the computer toys I wanted! [
] ]'>