I haven’t looked into all the Reiss-Premier models very carefully but every reference I’ve seen to R-P’s Premo dates to 1923 & 1924; in the latter year it was the subject of a determined promotion by the United Cigar Stores Company. Assuming the Premo was introduced after the formation of R-P (as seems reasonable) it would by definition have followed the introduction of the Kaywoodie pipe by at least a few years. But of course remember that in any case at that time the two pipes were made by unrelated companies; Kaywoodie was made by KB&B, which had not yet been acquired by Reiss-Premier. Of course if you have a patent number that might help with the dating too.
The Premo was a dollar pipe (cheapish by the standards of the day) and made from Italian briar which was supposedly “specially selected, very old fine grained, and extraordinarily well seasoned”. Such boasts were common and should be taken with a grain of salt. The color of the Premo was “somewhat lighter than the usual Italian briar - more of a mahogany tint”, and it possessed an “aluminum inner tube for easy cleaning”. Finally the ads boasted that the Premo, by virtue of its patented aluminum tenon, could not be broken:
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