The TBF and TBM had a total of 43 designations assigned to the various models produced by Grumman and General Motors. After the war, overblown news stories appeared about the loss of Flight 19's five Avengers in the ill-starred Bermuda Triangle

TBM means it was built by GM. TBFs were built by Grumman. I just want to point out the the Avenger is a massive airplane. It doesn't look too big in pictures until you note how small the pilots are, but it's huge. It's so big there's actually an internal cabin section for the radio operator!