From at least the late 1960s, law firms and banks produced Lucite slabs that encased the tombstone ads announcing new partner classes. By the early 1970s, deal closings were being similarly immortalized.
Law firms and banks began in the late 1960s to produce Lucite encasements for tombstone-style advertisements of new partner classes. By the early 1970s, similar deals were being commemorated in this manner.