A few years ago, the 16mm English hallmarked 9ct gold buckles would sell in the 80-110 gbpound range on ebay. There are two types - the square one that you have ( early 60s onwards) and a more rounded one (which from memory is slightly earlier -late 50s onwards).
Most were made by MWF - montal watch fittings, i beleive, but i think all should have birmingham hallmarks ( anchor)
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