A
B3 stamped one for sale on eBay described as "ANTIQUE BRASS POLICE OR FIREMAN WHISTLE" with additional info :
Quote:
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Marked on top 'Patent 6727'. Mark on side that looks like 'Rege Bukta' and another mark that looks like 'B3'.
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NB. A version called 'The City' has a patent number 6727-08 stamped on it which seems to indicate that minor modifications/improvements were made by manufacturer/retailers.
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