Well.....................

I don't see any lugs. Looks like a butt welded steel frame to me. The chrome steel wheels with little dimples in the rim is a trademark of inexpensive bikes built in the late 70's early 80's.

The Simplex shifters & Weinmann brakes are way out place on a bike with a Centurion label. The Centurions from that era usually had SunTour or Shimano components on them.

I've bought, sold, traded and refurbished at least a dozen Centurion bikes over the last twenty years. Never seen nothing like this before. Just guessing. This bike must have been built for the European market & not sold in the US.