Was it this ad?
Circa 1922:
...the same phrase turned up in 1921 too, and denoted as being new:
I'd also love to know if it was a sandblasted pipe.
I've only seen a few old blasted Comoy's with the older stampings.
One of the earliest examples I've seen,
courtesy of a Japanese pipe enthusiast blogger:
Blog entry here:
http://shuzed.blog104.fc2.com/blog-entry-64.html
...it is stamped as a Tradition.
Note the early rugby-ball stamp,
like that SuperSports you so kindly traded with me.
This one appears early too,
an Old Bruyere:
http://west55555.blog21.fc2.com/blog-entry-53.html
It would be great to know, and it is plausible that Relief indicated a blast, although there is a slight possibility it could've been rusticated -
I'm not well versed enough with the skinny on the C to say either way, but I'm glad you brought the topic up.
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