Is this the one where....
Is this the mummy film that shows via flashback what happened centuries previous in Egypt, why he was interned in such a manner, and the reasons? Seems as if I recall him being wide awake while being wrapped with linen, and they had removed his tongue so he couldn't cry out to the gods for help. Then there was the gruesome scene where all the slaves are killed to prevent any disclosure.
Last year I saw the 1932 version of The Mummy, and it didn't have any flashback scenes...so it was the later films that had the flashback.
I recall seeing several mummy films from the 30s and 40s on Shock Theater when I was 10-12 (early 70s), and I vividly recall the flashback scene in more than one of them.