oK - I am a collector, last tip 1999, originally the trikes contained approximately .652 troy ounces of .999 silver.
Was there a date that changed ? Was the .999 on the rim instead of the coin then also ?
Trying to establish values for the Estate of a method =
Highest silver content has .999 on the coin ?
Second highest silver content has the .999 on the rim ?
Third value if a clad coin determined by ?

If I use the clubs listings can the issue date be a guide ?

All silver info - not collectable or error print.

Thanks for any response