Very interesting.
So basically trade new generic silver rounds for older, rare, less generic silver?
Generally, yes. Just buy silver at the lowest premium you can. Unless you find an
exceptional deal online, you will
always pay less for silver in-person, at a brick and mortar shop. The shop I work at offers generic bars and rounds for $1.50 over spot. These could be anything-they might say "Merry Christmas 1975". But, as mentioned,
silver is silver. Buy 10 of those and the shop owner will gladly trade you whatever 10oz bar someone has recently sold (I see A-Marks all the time, OPMs almost literally always, Johnson Mattheys and different brands all the time). Everything besides Perth Mint stuff, Silver Eagles, Pandas, Philharmonics, etc are considered "generic silver" and thus sell for the same price over spot regardless of if you buy 10 x 1975 X-Mas bars or a 10oz A-Mark bar, which for some reason people on eBay are willing to pay a mint for (pun intended). Truly I don't understand what goes through the mind of your average eBayer-but I try to take advantage of it!
What people seem to be willing to pay the most for on eBay are
brands like Engelhard, A-Mark (Engelhard stopped producing in the '80s, A-Mark started up again but it is their old pieces people want), so
old pieces, and l
ess-heard of mints (Academy Silver, Scotia, etc.). They also like
anything hand-poured. And finally either
odd shapes or weights (like the 10.2oz bar I sold)