Wally -

the sheath is an HKL irrespective of stamp orientation or snap location. Just look at it. I don't find it surprising the sheath was available from the shop for a 2-8. Viet Nam had not cranked up to what it would become, and a 2-8 probably wasn't in hight demand. It took some time for the shop to exhaust the supply of many of the HKL sheaths with some remaining for many years. They were socked away as I believe the Johnson with the baby dot snap was deemed a more durable product.

It is a valid point you made that any one of the three could be correct, although I would be suspect of a Heiser marked sheath. Not impossible, but improbable. Perhaps a field knife would be more likely.

Tom Clinton bought a bunch of old brown button sheaths from the shop I think it was in the 80's or 90's.