What The Smallest Coin Exchange Value You Keep

A problem that arises, is what you do with all of the (sometimes very multiple) duplicates that you don't need after buying many large bulk lots.
For me, this is where the individual value of a coin has to be considered and how many of the more valuable duplicates you keep, before disposing of the rest.

With culling, condition reigns supreme, and keep the best examples. Lowest exchange value not relevant, if a particular coin is unique to your collection.

Sometimes, type date and denomination sub-collections within an OFEC collection can be considered. I have done this for many countries. It can also be an introductory way of branching out into ancients, medieval and milled coins.

To cut down the possibility of acquiring so many duplicates, I tend to search dealers' junk bins.

Haven't bought bulk lots for decades, because after the valuable and the interesting coins have been stripped from the lot, the remaining junk is difficult to move.
In fact, there were a few occasions where I just gave the stripped out lots away.

That is why I changed policy of instead of buying bulk lots, I now search dealers' junk bins for any individual coins that may be a worthy addition to my collection. I am happy to buy any individual coin from 10 cents, up to an unlimited value.
Because my collecting interests cover the whole of numismatics, any interesting or bargain coin is much easier to find. I guess that sort of policy makes me somewhat of a 'numismatic scavenger'.

I scan public numismatic auctions in much the same way, although I have to bid instead, and the prices may be at hundreds of dollars. I this sort of situation, I do lots of background numismatic and market price research first, before placing a bid, because there is much more money to be spent if successful.

I reckon either japanes 1 yen or more likely the Chinese 1 fen (1 cent), or 1/3 farthing 18xx (don't remember date) that I have.

Exchange value/Intrinstic values change, and can be arbitrary due to a loss of faith for redemption. You should exclude all paper money since I could consider monopoly as money collection bahaha (has value as set are worth RRP of about 25-30 dollar AUD)

The 1/3 farthing is a copper coin that's as small a gold 1/20 ounce gold coin, and 1 fen is a plastic coin. I would say I think maybe the siege money and paper coins (very collectable especially in high grade),plastic tokens or wooden token would be lowest exchange value as once redemed should have no value in the eyes of the state.