I'll admit at first I was a bit disappointed that what was advertised as a 71 turned out to be a 72, but if I believe the seller when he said his wife bought it for him in 71, which I do, then despite it being marked 72 - it was actually made it 71 as 72 hadn't actually happened yet. So, I'll consider it a birth year pipe no matter what it's marked.
Sorry Simon - I'm keepin it!