I received a vintage Onsa watch today, everything was fine and as described by the seller except the spring bars were corroded. The watch is stainless and was fine, but I couldn't remove the Spiedel expansion bracelet, that was included with it. I don't like expansions that well so I sacrificed it using my Dremel tool and a cutting wheel. I didn't intend on damaging the band but being cautious I erred toward the band and not the watch case. After I finished I fitted a used vintage Champion mesh I had been saving for another watch.
How common is it that the spring bars corrode to the point that they have to be cut?