Swiss 100 Francs Proof

I'm not entirely sure about the existence of a Swiss 100 Francs proof coin struck in silver between 1970 and 1980. Switzerland's mint produced high-quality proof coins during that era, mainly in gold for denominations like 100 Francs, while silver proofs were more common for lower values such as 5 or 20 Francs. If such a silver version exists, it might have been a limited commemorative issue, perhaps tied to events like the 1976 Olympic Games or national anniversaries, but records are spotty and I've never examined one firsthand. The Swiss Federal Mint in Bern was active then, using .900 fine silver for some proofs, which could mean a 100 Francs piece shared that composition if it was experimental. Without concrete evidence, it's hard to say more; numismatists often debate these details over a cup of coffee that could use more caffeine. What I do know is that Swiss proofs from the period emphasize precision and clean strikes, reflecting the country's engineering heritage.