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Hi Gary, the maker's mark is a leaping (jumping) deer or Capricorn and so far, of a unknown Rotterdam master, registered around 1735-1753. The year letter M for Rotterdam 1746. This maker's found on a zilveren cabaret/silver waiter with year letter Rotterdam T for 1753.
Source; N.I. Schadee Zilverschatten drie eeuwen Rotterdams zilver.