Marked CH Dorcas 4 !!!, no hallmark as such. is this a Charles Horner No4 Dorcas thimble or just wishful thinking !! 
. Top decoration appears Gold or Gold washed. Thank you in advance 
No hallmark = not silver. Most, if not all, silver Horner thimbles I have seen have a Chester hallmark.
Phil
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Me too to be honest, it looks silver, but I’ve nearly always had them with a hallmark . Thank you Phil