Steve Norse from Vermont Freehand had a tin of this stuff just before the Chicago Pipe Show, and I emailed him what information I could find from the periodicals I had on hand. I think he did open it but I don't recall having read a review / reaction / autopsy.
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As I recall C Fryer & Sons claimed to date back to 1803. The gross inaccuracies in many of their advertisements a century later suggest a certain degree of skepticism is warranted. They claim Bryon, for example, lauded their Special Mixture in 1803 in his poem “The Island” with the immortal lines…
Glorious in a pipe,
Mellow, rich and ripe
…lines which appear in numerous C Freyer advertisements.
Alas “The Island” wasn’t published until 1823, and there is no reference to C Freyer’s tobacco in the poem.
Having said that the business did date back well into the mid 19th century, although for much of that time it was styled Fryer & Coultman (after owners Christopher Fryer and William Henry Coultman). And prior to the time Coultman, who started as a clerk and worked his way up, came on the scene various Freyers were involved in the manufacture of tobacco since at least the 1830s.
More immediately relevant to the question at hand is this advertisement from July 1930
which demonstrates that the fine cut version of the Special Smokynge Mixture was available at least a generation earlier than 1955; and presumably sold to tourists at ye Olde Shoppe in between ogling buxom wenches in Jacobean garb, oohing and aahing at authentic relics of Bonnie Prince Charlie, and taking turns on the dunking stool.
PS Congratulations on a wonderful find. I hope you find the contents beautifully preserved when you choose to crack the tin.