Bottom bracket type?
 

I'm stripping down a Trek 520 and came across a non-Shimano BB for the first time (out of the 5 or so used bikes I've stripped) and don't know how to identify it/what tool I need to remove it. Can anybody help me out?https://cimg5.ibsrv.net/gimg/bikefor...22a46db82a.jpg

An adjustable pin wrench should work to get that out, eg for one shot use: https://www.harborfreight.com/adjust...nch-36554.html
Obviously size of the pins is a parameter. I still have a cycling tool pin wrench in my tool box I haven't used since the '70s, but got for some
forgotten BB cup like that.
OTOH a punch and tapping gently with a hammer may be all you need.

Is that a SunTour unit? It looks like an adjustable pin spanner might engage the cup's holes. (maybe the common Green Park SP-?) I suspect the specific tool used the lobes instead. I've used nails and skinny drift punched held in the vice if the tools usually at hand were "missing". Andy

less type... than brand/maker , type is square taper..