Date discs on many Omegas of that era are made of plastic. The internal teeth chip. When that happens, the calendar does what yours is doing. Replacing the disc is the only cure. Replacement NOS plastic ones are hard to find. I recently read that after market metal discs are available. No idea how to locate either. The last one I found for an Omega of mine, I found on eBay. It came from a collector in Mannheim, Germany.
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