My recently purchased Omega Speedmaster Coaxial Chronograph 38mm (ref 324.30.38.50.01.001) uses the same 3330 movement as your Speedmaster Racing. Have noticed when setting & handling it I can clearly feel and hear the rotor movement. Looking at blowups of the movement on the Omega website, you can see that it's clearly a ball bearing on the rotor. Feels normal on the wrist and is, so far, running about +1/sec/day. My (recently traded) Seamaster 300m (ref 210.30.42.20.03.001) w/8800 movement never made made any sound I was aware of, unsure if it was ball bearings. Neither of my Seiko watches with 6R15 movement make any sounds. I would imagine that each movement would have it's own sound/feel. I wouldn't be concerned if the watch is operating/timing properly.