What's the difference between a strip stamp and a tax stamp? I'm looking at the two "dusty shelf" bottles I found a couple of days ago. The red and white stamps on top say "Bureau of ATT, Distilled Spirits". Are these tax stamps or strip stamps?As Bettye Jo has noted elsewhere here, Heaven Hill continued to use strip stamps as tamper-proofs until well into the '90s, and I've found many strip-stamped bottles (not tax stamps) from the late-'80s, early-'90s period.
There was no uniform date when tamper-proof caps came into being -- it varied greatly by distillery and brand/label.