Not a Moggy 1000 one, they had a three pronged internal bayonet type clasp, this one is external. (I do appear to be displaying a lot of BMC related trivial knowledge today!)
From my time 'working on the pumps' back in the day, I'm struggling to think of tank caps that were external types, or were some of the Ford ones? Someone like Gordon or Zeff will probably put me right.
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