Most of the old cutter tops are very difficult to precisely date because they made them all the way up until the late 1960's,
so in most cases it's a rough estimate of timeframe based on various clues...
...in the case of pre-1959 cutter tops that were imported into the USA however, it was required to have a tax stamp which included a date-coded series number, allowing precise dating, like this one from 1949:
That was an old tin of Scots Cake that I was lucky enough to find,
and when I decided to distribute some samples, most everyone agreed that it was pretty damn good stuff!!!
http://pipesmagazine.com/forums/topic/smoking-some-65-year-old-scottish-flake-a-group-review
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I've had flat old stuff too though and there are myriad variables involved and it's always a gamble and you just never know until you smoke it and even if it's the best shit you've ever smoked there are some people who'll never believe you and continue to insist that the good richness of such superannuated old stuff is a romantic self-deluding myth... :
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...like John Loring said,
they'll call you a goddamm'd liar!
I smoked another bowl last night, and today I started off with it in a 1928 Dunhill 126 Shell that married delightfully with the medium-light matured virginia blend. I don't know what the blend tasted like in 1955 but notwithstanding the packaging it's a wonderful smoke today.
And if you showed me the tin & told me the story, I would swear you were a g-d- liar ...
http://www.loringpage.com/attpipes/tobacco-rustedtin.html
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