@ Imag8r
You really need to get a pix of your coin questions. Depending on grade your Swiss coin can range in the real world From $50-$450. Price guides like NGC are greatly inflated BTW.
DO NOT attempt to "make yer coins purdy"! Only what is considered safe to do, such as soaking in acetone and rinsing in distilled water, PERIOD! Nothing else, no scrubbing, harsh chemical even soap isn't recommended. If you just have to have it cleaned, let the
TPG do their "restorative" function, pay them to do it right.