On your 72 It's likely original and never got stamped, I've seen a few examples of VIN stamps that got missed on either the trans or engine, seems most common with LA.built cars, especially really sloppy stamps. If yours is a warranty block it will provide other clues and was almost certainly installed somewhere other than the production line. Post some good pictures of the front and sides of the block if you can.

i thought the numbers stamped on the core support and the sail panel were the build sheet production number--that is why the build sheet is important--you cant see the sail part unless you pull the rear window out---bob

Scott

Do you want pictures of the both sides of the block and and do you want the hole side. Also do you want the whole front? What are some other ways you can tell if it is a warranty block?

Both entire sides and the entire front (must be clear non blurred pics). I won't say all the details but I'll point some out if I see any indicators.

I have tried to post pictures but it doesn't work. What is your e-mail address and I'll e-mail the pictures to you direct.

Thanks

I've seen several that are hard to read. I have a 72 340 that is missing the second digit in the sequence # entirely.