Made in Scotland Scottish Sterling Silver Celtic Arts & Crafts Fish Pin Brooch

From England, may I offer this C.1951 Edinburgh Scotland Sterling Silver (hallmarked as pictured) celtic pin designed as a fish in an "arts and crafts" manner. Makers initials are D.S. in a rectangular box and I could find no info on this maker. Size is 2" x 1-13/16". Weight is 11.1 grams. Safety catch to hold the pinstem in place. Very nice condition with no problems I can spot. Nice shine to the silver.