Gold hallmark ID help

[gtoast99]

Hi y'all! I found this yesterday and posted over in today's finds, but I thought I'd put it here too for some more eyes. I'm trying to get an idea of the age of this gold ring. There are only two hallmarks, 18 and a crown. The 18 is very harp but the crown stamp is lacking in design details. The site it was found has some 200 years of human activity, so who knows.

Can anyone tell me anything that could help date it from the limited hallmarks present? Thanks!

 

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[money malcolm]

https://books.google.com/books?id=6...#v=onepage&q=crown gold standard mark&f=false

 

[bigfoot1]

pretty sure the answers you got on todays finds hold water...sweeeet find