I am familiar with both the RB600 and RB900 arms. Waynev, you do, in fact, have an RB900. Both are silver in color. The RB900 is unique in that it is the only Rega arm using the three screws. The RB250, 300 and 600 use a single post through the plinth. The RB900 uses the highest grade, lowest tolerance bearings of the bunch and is the most labor intensive to manufacture. I recently had the Incognito wiring mod done to my RB600 and during a conversation with Steve Lauerman, he indicated that the manufacturer of the RB900 only produces around three arms per day. Therefore, I'd say you got your money's worth.