I took these shots a few months ago in my local yard. This was found in a 1979 300TD. I was going to pull the motor but by the time I got back, it was already crushed.
The interesting thing is it does not have a "Bm" field as the other post have shown. Also the printed "80" was xx out and "88" was stamped above it.
Teil-Nr: 6170103802 (88)
Aggregat Nr: 644517