Have to agree with Lehigh. That said, forecasting increased values and purchasing accordingly is a part of the allure of coin collecting. My 13 s dimes have taken a nice increase in the last 18 months. Conditional supply is also a factor. Compare mid-twenties S & D mercs to 10-15 S Lincolns. The 23 S, 24 D & S, 25 S, 26 D, 27 D & S, 28 D & S all have comparable mintage figures and XF/AU values to early S Lincolns. The merc's are much tougher to find......less supply in those grades. The Lincoln's are likely to increase in value due to factors stated above and in other posts. Will the merc's? As for series like shield nickels, trimes, etc.....Maybe if Jessica Simpson did a little dance in some movie using shield nickels as cover for certain aspects of her anatomy that would drive demand.
I was trying to keep it simple. Although we know the mintage, we don't know the condition of all of the coins minted which can have an effect on supply in both directions. Melted coins can reduce the supply and coins found in shipwrecks and bank vaults and hoards can increase supply. However, I think at this point that the number of undiscovered coins in Mint State is probably rather small. I was using the mintage figure because others were using it in this thread.
If you like low numbers for inexpensive prices, check out Civil War tokens. There are thought to be around 1 million total still around for all 10,000+ varieties. Some in the 2-4 known range list for as little as $50 in uncirculated condition. I have picked up circulated examples in that population range for under $10. As Lehigh stated, you should try to determine which series will attract the most new collectors. The 150th anniversary of the Civil War is rapidly approaching, and even a small number of new collectors could create a significant impact. I may sound like a seller, but I'm not. But I do find these tokens to be much more diverse and interesting than the regular coinage that I collected for years. Just tossing my opinion out there for what its worth.
And that's not likely to change. There's no reason to believe there will be a sudden increase in demand (though I personally like 'em).
1883 No cents liberty nickels don't have a really low mintage but it is relatively low compared to some other coins in that series and it has the lowest book price of any liberty nickel in ms60.
These are a 2 year type, in that regard they have a low mintage. The entire type has a mintage of a little over a million with most destroyed http://www.pcgscoinguide.com/displa...ries 29)&universeid=313&guidesubcategoryid=60
This is exactly why I decided to collect them now. Most collectors only buy one for their type set, I dont know of anyone that collects these in an attempt to complete an entire set, except for me.
That's because everyone saved the things, the With Cents version has triple the mintage but nobody saved them, hence it's a bear to find in nice shape, in comparison to the No Cents variety
One would be the 1872-S dime. I recently lost one on ebay by $5 (was annoyed at that), and found only ONE on heritage that had been sold in the last year. It was AU details, and harshly cleaned, and guess what? It went for the same price as a problem-free AU-50 in the numismedia guide.