There's a couple of oddities about the Dewars, the foil capsule wasn't in general use until the 1960's/70's when lead capsules became too expensive, the driven cork went out of fashion and wasn't used after the 1930's and Dewars stopped using NB in their address around that time as well. To have a label without content and strength as well as Bottled in Scotland is against the law so could never have been sold.
All in all it looks very odd, I'd give Dewars in Glasgow an email and check with them.
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