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Re: 1748 dated silver jar
looks to be pewter. u should have it tested,or, look for a lion hallmark on it anywhere,which is a mark for sterling. i believe the 1748 is not the yr. it could be a founding yr of the maker,some companies do that. just some thoughts to look into but please dont holdfast to my words. just some things ive learned. best wishes.
Re: 1748 dated silver jar
It's pewter, the older examples will have what's called a "touchmark" that can indicate a maker and quality of the pewter. The 95% marking is an indicator that the pewter used to make it is higher quality , being only 5% lead.