Curiosity about a mark

(The Netherlands)

Back of the brooch with number '59'

Back of the brooch with number '59'

I have a brooch - just a piece of costume jewellery, nothing of any value, I'm sure - which is marked on the back with the number'59'. Out of curiosity would like to know what this refers to. All searches to date have come up with nothing whatsoever.

Can anyone help with any information? Thank you!

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