if the coin you have here is a 1976 piece if it was to be a doubled die it would probably be from the doubled master die and not worth a premium.
keep looking and you may find something good . I know that lately the coin rolls I look thru are bare of anything good. Too many folks are searching thru the bank rolls.
Hold on for a couple of days AC. Im sure we can all put our minds together and think of something that sounds legit. Oh no I think the toaster is on fire. Time to use a metal object to get the toast unjammed.
Probably dated in the mid 1980s. (Could be 1983 to 85 D) The coin looks like it was used in casino slots back in the days when the halves were still in use.