This looks to be a cartridge bearing BB , sans the central cartridge. The bearings are in the rings, and are adjusted to zero out any axial movement by adjusting the left (on some it's either) ring using a splined tool (most likely the same as Shimano) then locking the adjustment via the lockring.
BTW- Do not Preload the same as you might a classic cup/cone BB. Take out any play, but leave stay as close to zero preload as possible, even if it means leaving that last doubtful bit of vestigial play.
As to the brand, there were a few of these types over the years, including OMAS, and Real, but this one doesn't look like either. So you may check if it's the type I'm describing by removing one cup/ring entirely, or simply adjust by touch if it acts right.
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Last edited by FBinNY; 06-04-14 at 06:57 PM.