parts mixed by past owner .. its a loose ball BB square taper axle type..
You show the Adjustable cup + a lock ring.. Only show the drive side, ... from a distance ..
Bike shops will have the tools to remove it,* then you can put something of your choosing
in to replace it..
*so you don't have to buy them to use once..
..
Last edited by fietsbob; 04-01-19 at 01:55 PM.