what does this mean 1/10 10k??? gold or junk???

[chong2]

i was going trough some of my stuff and had this pin. its stamped what you read on the back of it. its stating 10k, but whats with the 1/10? does this mean plated i have had this for a few years and dont wanna scratch it. do i put it with my gold stash or junk box

 

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[jeff of pa]

Gold plate.