Here's a bit of useless trivia. That Cutler-Hammer switch was designed by Brooks Stevens, one of the great industrial designers of all times, who also designed the 1962-64 Studebaker GT Hawk.
Minor correction - a momentary switch usually has only one button. Hold it down, it does one thing. Release it, it does the other, depending on whether it is a momentary on or momentary off. There are also two-button momentary up/down and forward/reverse switches, but those are labeled as such. The one shown is a true On-Off switch to start and stop electric motors on power tools. Push ON, the motor starts and runs until OFF is pushed.
And finally, I have that exact switch, but it is going to stay on my Delta band saw.
jack vines