Hallmarks on gold

[PW333abc]

I would be very grateful for answers. I wonder if all objects in gold are always stamped with purity in all countries? For example, 333, 580, 750, 9K, 14K, 18K. Even objects made in the 18th century? Some countries have both Hallmark and purity stamped.

Do you have tips on a good site where you can see gold stamps from different countries?

Best regards

Per

[AG2012]

Hi,
There is a book:
Poinçons d’or, de platine et de palladium (International hallmarks on gold and platinum) by Tardy

Refaeds

[PW333abc]

Hi,
There is a book:
Poinçons d’or, de platine et de palladium (International hallmarks on gold and platinum) by Tardy

Refaeds

Thank you very much for the answer.

Best regards

Per