Sterling coaster

[Aronkusa]

hello!
I have this antique sterling coaster with a wood on the bottom, and I can't find any hallmark but its tested sterling silver,anyone knows the maker of it ?

[img]https://i.ibb.co/[url=https://ibb.co/Jjnh0GH][img]https://i.ibb.co/Jjnh0GH/Copy-of-20200515-014949.jpg[/img]/Copy-of-20200515-015021.jpg[/img][/url]

[Aronkusa]

[dognose]

Hi,

Wine coasters such as these were probably made by hundreds of manufacturers around the world over the years.

How have you tested it?

Trev.

[Aronkusa]

Hi,

Wine coasters such as these were probably made by hundreds of manufacturers around the world over the years.

How have you tested it?

Trev.

Thank you!
tested it with 18k gold tester!