Really need to know the footprint to help. Also, latching or momentary? I'm guessing latching looking at the trimetal schem.
If it's the power and 2 pole, it's almost certainly a dpdt on/on or possibly dpst on/off. If it's bypass, certainly a dpdt. I'm guessing submini footprint from the photos. If you have any subminis laying around, see if the footprint matches. Or is it smaller than submini?
Really just concerned about the footprint, height to shaft, height of shaft and diameter of shaft(depending on if it "nests" in something). Maybe the vertical throw length of the switch/button. Moreso, make sure the new one isn't too short of a throw and gets crushed first footpress.
Here are some options, submini latching dpdt.
The NKK BB26A look to be a very similar from factor. though, the
vertical models mouser stock lack the top cap.
Look at the NKK BB series datasheet, page 5 and 6. If the footprints align, compare those measurements with yours. again, more concerned with height and actuator measurements.
BB series datasheet,