mystery mark - would appreciate input - thanks

[heatherwest]

here is a photo of a gold (plated?) box that my mother found in a charity shop in british columbia a few years back.
the mark, as i can see it, is only an 'AB' within a diamond.
and there is a # 17009 as well.

does anyone know where this could have been made? and around what time? the wear seems to indicate that it is old...

any advice or input would be much appreciated! thanks


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