Bracket Bottom type and how to remove it?
This looks like a standard British bottom bracket with a fixed cup and adjustable cup.
This article gives a good overview of how to service. It looks like your lockring is missing. Also, it doesn't look like you'll be able to use a pin spanner on the adjustable cup. Not clear from the photo what kind of wrenching affordance the cup has, but it should have some kind of wrench flats, so possibly this kind of tool is what you need. Also note that the fixed cup can be extremely difficult to remove.