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Kosikup mouthpieces have been mentioned as the preferred ones of British brass band tubists some 50 years ago. They are rare today, but some photos popped up at an auction:



What is the text below the arched word of Kosikup?

Here sin to the left together with a Conn #2:



K

Regd = Registered [probably]. We used to write/etch Regd with gay abandon in the old days!

Locky