Sealed Cartridge Bearings?

I was gonna overhaul the bottom bracket till I came across this (see picture).  I was expecting to see the standard one piece bottom bracket setup. 

It looks like sealed cartridge bearings.  I didn't know they make it for one piece cranks.  If it is...it shouldn't require any maintenance for a long time.  Anyway, I couldn't remove it easily so I left it alone.

P.S.  To remove the locknut you'll need a 30mm wrench.