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Trivia: Serial numbers of the form “09mmXnnnnn” can also appear as “9mm-nnnnn.” Such instruments would have been made in (late, usually) 1969, when the change in format was underway. I suspect this was a practical matter: serial number tags would have been ordered in quantity and in advance of production. Production management, if several hundred of the old serial tags were in stock, would lean towards using up the old ones before bearing the expense of ordering new ones.?