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And the copper is very thick. About the thickness of a penny ..... maybe a bit thinner. It is usually sold by thickness - 2 mm, 4 mm and, rarely, 4 mm or thicker. You can usually see the copper's full thickness on the edge of the pot. Copper visible on the outside and tin on the inside, with copper and tin sorta mixed in visibility at the edge. The tin is put on by hand with rags while molten, so the edge is never perfect.
Some pots have rolled edges, so no thickness edge is visible. There you just sorta hafta know. If it is tin lined, you may well see some rag marks (think of brush marks in a painted surface) or some wear-through where the tin is gone.
If the pot is stainless lined, the only thing you have to be mindful of is whether the pot is copper with a stainless lining, or if it is three-ply ..... stainless inside, aluminum core, and copper outside. These are lesser pans than all copper with a thin stainless lining.
All my copper is tin lined.
A word about the tin lining being worn. If the pot is heavy, it could well be worth having it retinned. The cost is about 4 bucks an inch. You measure the diameter of the pot and add twice the height. A 4" deep pan that is 10" in diameter would be 4+10+4=18x$4=$72. The copper pretty much never wears out, so replacing the tin is essentially getting a new pot. They can also remove dents for you if you care about that sort of thing. A used pot is, therefor, a good buy if it is worth, new, something in excess of .... I dunno ...... twice the retinning cost? The actual retinning cost? A newly tinned pot, properly used, should last ten or twenty years. A well cared for quality copper pot will serve at least your grandkids.
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