Although I might be termed a 'numistmatist' by some, when it comes to World coins, I am definitely a humble 'coin collector'.
When there is a scarcity of silver coins to be found in dealers' junk boxes of today, a different strategy has to be adopted, if your collection of World coins is to grow and be kept interesting.
1). I ask myself a couple of questions:
What are the most valuable base metal World coin types that have been issued in the last 200 years?
2. What would be the coins that my father would have collected (grandfather, if you are younger), if you wanted to build an interesting collection?
As with all collectors, even with base metal minor coins, always get the best condition that is possible. Even with base metal World coins, top condition World coins can be relatively cheap to buy in lots of cases.
These days, I tend to concentrate on the period from about 1820, and from when copper nickel was introduced (1856). Not much interested in coins issued after about 1950.
I am happy to take early 1800's coins lower grades, provided they are not junk, and the price is low.
With these three strategies, I am still a very active cherry picker.
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The answer to question 1)., is best provided by an old copy of Krause World coins 1900-2000, and if possible, and old copy of Krause World coins 1800-1900.
On line 'NCG World coins values' also helps,
but the books are the best way to build your knowledge as a whole, by just browsing through them, when you have nothing else better to do, or you are looking for the details of a specific coin.
A cheap way of having some fun, and learning something of the World history, by actually handling some of the 'hardware'.
I am an old guy now, but I have never stopped learning since I was a child.