Sunshine Mining 1 OZ silver rounds

Sunshine Mining struck an undated 1 OZ silver round.  This was in addition to the 1 OZ rounds of the years 1979 thru 2000.  Can you tell me what year the undated round was struck?    Many Thanks

There are several undated silver rounds from Sunshine Minting on Numista. Not sure which one you are referring to. All of the undated ones were added by members and if a date was not included the odds are they did not know it.