Which Halves should I check for a missing FG?

[mleblanc138]

Which years should trigger an automatic "check the back" response in my head? I'm not going to spend time checking every coin front and back, so I just want to know which ones are most likely to have the missing FG letters, and will eventually check the back of every half from those years, as I already date check all my halves.

 

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[spjegues]

1972 D

1982 P

1983 P

that is all I check.

 

[BuffaloBoy]

whats the value on a coin like that?