You might check out coppercoins.com for the markers of various 72 DDOs--there's quite a few. 
Btw, the small date variety for 1970 was limited to cents minted in San Francisco. And they're darn hard to find in circulation! Good luck!
Btw, the small date variety for 1970 was limited to cents minted in San Francisco. And they're darn hard to find in circulation! Good luck!




















