Clearly another newby question Other than currently rare/valuable coins, what sort of guidelines do collectors use to help in deciding which coins are worth holding on to for potential future value - quality, circulation qty, ??? I realize many will keep various coins based on their individual collection preferences. Following are some penny's I've found that might be of sufficient quality to keep?? What do you thin?

1964-1 LMC Obverse edit.jpg 1964-1 LMC Reverse edit.jpg
1964-1 LMC
1964-2 LMC Obverse edit.jpg1964-2 LMC Reverse edit.jpg
1964-2 LMC
1964-3 LMC Obverse edit.jpg1964-3 LMC Reverse edit.jpg
1964-3 LMC
1964D-1 LMC Obverse edit.jpg1964D-1 LMC Reverse edit.jpg
1964D-1 LMC
1964D-2 LMC Obverse edit.jpg1964D-2 LMC Reverse edit.jpg
1964D-2 LMC

THANKS AGAIN!!!!