For the record, the master link on my father's Roadmaster had a dogbone-shaped side plate. It was very difficult to pick out from the standard links. The chain on my Roadmaster had the typical non-dogbone side, OTOH. Oh, and the chain on my mother's Schwinn simply had no master link that I could identify. I had to use a chain breaker and add one to service it. So those anomolies are out there.