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Your date is on the left and the date of an example sold by London Coins Auction is on the right for comparison. If you balance the coin on a finger and gently tap on the edge with another coin, you can hear if it rings like silver. Copper coins and nickel coins sound very different to silver when tapped this way. (Try out on some scrap coins and you will see what I mean). Wear a glove if the coin still has residual lustre and you want to be extra careful. (Obviously, you won't want to do that with an UNC coin). The coin should be genuine if it is made of silver.

I'm not convinced about the limited amount of wear having much infuence on the interiors of the "8" or "9" even allowing for the inside edge to be slightly bevelled - images of similarly worn coins appear to have larger interiors and I have not ( in ten minutes) been able to trace any currency examples with an 8 or 9 similar to Bruce's specimen. However, an 1879 proof does seem to have slightly thicker 8s and 9s to currency examples. In Bruce's specimen, the "7" is also thicker than normal, but some variety in this character does exist in currency specimens, so why not thicker 8s and 9s. Perhaps useful to check the size and weight of the coin.

The date looks OK to me. The numbers are somewhat fatter due to wear I think.