This is a Micro-Probe  card used to probe chip dies.
The probe pins are straight - protected by a plastic box over the reverse side.
From the reverse it shows there are 48 pins - from the front it shows 47 and 1 unlabeled - labeled on the blue disc.
On a label in top right corner, it states die size is 1.81 x 213
The gold edge pins do not show any signs of use - like scratches from insertion.

The plastic protection is held in place by what looks like scotch tape.