It was listed by Robert Harris Jewellers. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Robert Harris Jewellers has dated this piece to the 1950s.
SPECIFICATIONS

Pendant diameter. 22mm
Weight. 3.4 grams
18k gold
ERA
Circa 1940s – 50s
STAMPS & HALLMARKS
Stamped C18 F (F may signify 1942, although no full hallmark stamped)
CONDITION
A later pendant bail hallmarked 1960 has been added.
Robert Harris Jewellers has dated this piece to the 1950s.
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You can view the stock and full dealer information on the Robert Harris Jewellers Profile Page