Bugsy,
The 10 inch discs certainly were played at 33. Bit of usless info - they were quite often 78 presses that were being reused, the ealy TOPIC records for instance.
However there were 7 inch records which played at 33. They were revived by (I think) PICKWICK, who released a set of Greatest Hits EPs by many artists, in the 70/80s 7 inch, three three-minute tracks a side, playing at 33.
love, john.