Korean Silver Spoon with "Silver / Silver" hangul mark

[hpidaves]

I have a silver spoon that has the Korean mark shown as number 3 (Silver / Silver) in the 1910-1945 section on the following page:

https://www.925-1000.com/Fkorea_01.html

My question is to purity of the silver (percentage) for a solid silver (not plated) piece with that mark.

I will attach photos, but I had to use a microscope to read the mark accurately.

Thanks.

[zhaosu]

Characters on the mark are "銀은", "銀" means silver in Chinese (people in Korean call Chinese character as hangul), "은" also means silver but it's a Korean script. This spoon was likely in 1960s or 1970s in Seoul.

[hpidaves]

Thank you again :)

Is this solid silver? If so, can you tell the silver content?

Thanks!