Re: Inauspicious Beginnings: 1961 Schwinn American.
A Park brand pedal wrench #PW3 has served me well for years but sometimes they're like welded it and nothing breaks them loose. Don't sacrifice the frame trying too hard. There's lots of Schwinn pedal cranks available just like yours. Cut it off at the left nut and use a socket. Saves a lot of grief and time trying to save something easily replaced. Just a suggestion because I've done it before.