There were closer to 10,000 records in the lot. Many of the 78s were clearly radio station inventory, dating from the early to mid 50s. Of those promos, many are pressed in vinyl. Overall, the sound quality is excellent, as good as if not better than 45s and LPs from that era.
Here's a batch of WLP 78s I pulled out of boxes to photograph:
The vast majority of MGM promos I've got are yellow label, similar to retail copies but with "Disk Jockey" printed on them. So this WLP MGM is unusual.
Not very common, but I've got a few yellow label Capitol and RCA promos.
Decca and Coral labels used pale blue and pink in addition to white for promo labels.
