It has the word “Patent” but no patent number. I think it is made from nickel plated brass and has the original brass chain with hook.
The Metropolitan City of London Police Reserve Whistle w/ Chain 1911-1919 WW1
Dora and The Lost City of Gold 2019 Promotional Yo-Yo - Film Movie Promo Merch
3 Vintage Whistles, The Metropolitan WW2 marked. The Acme Boy Scouts & Acme City
The Metropolitan Opera - New York City 2025-26 Season Guide - New
Antique c1884 Victorian Liverpool City Police Brass Whistle The Metropolitan
Lot of Photos, Letters, Ephemera + autographs concerning the Metropolitan Opera
