Summary

A socket for Cathode Ray Tubes like the CV1591 thru CV1595, also called VCR.517 thru VCR.517E

Socket B12D is also (incorrectly) called SC12.

As contacts, use https://www.ebay.fr/itm/20X-Battery-Positive-Negative-Spring-Contact-Plate-fit-for-AAA-AAAA-Batteries/323755310121?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

If you prefer genuine sources, use Keystone electronics surface mount battery contacts 5231