It is used on the external end of PCMCIA cards
The PCMCIA business is pretty dead now...
I don't mind if it has a cable attached to it. I believe there was an IDC version, intended for some obscure-pitch ribbon cable
Heavy googling finds some products which might be using this connector e.g.
and this one is probably the closest since the PCMCIA card is actually an ARINC429 one from MAX Technologies. It is incredibly expensive but I got it on Ebay for about $200 and I am trying to get it working, just enough to be able to monitor ARINC429 packets.
Many thanks for any pointers :)