Produced from 2010-2012 the Certate 10 was the first major refresh of the Certate line.  All models received an upgrade to Daiwas Air Rotor which also required Daiwas new Mag Seal bearings.  Due to this upgrade the spools of previous Real Four model reels are not compatible with the new Certate.  Models 1003, 2000, 2004, and 2506 have the I-Shape knob, the rest have T-Shaped knobs.  The 2500R is a 3000 sized body with a 2500 sized spool creating the most robust 2500 sized reel on the market.