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The change was made with Pearlduck so that would probably be the 1950s I would reckon. I think the later Beau Brummels also used the cracked ice celluloid scales similar to what Pearlduck used.
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I have a few of those. Check daffy ducks in the clubs section. keep in mind Brummel was a totally separate company apart from the ducks. At some point there was an arrangement between Brummel and...