I love hummers and think the tuning fork genre is incredibly interesting....from the technical advance at the time to the sweep of that second hand. To that end, I have aquired an Omega f300 and an Accutron RR 218 and delighted with both. I am sorely tempted to aquire another Omega f300 which has been serviced and looks great. However, this one is pricey, perhaps reflecting the service, new battery and crystal. Is there anything I should be checking/concerned about...oiling, copper plates, friction wheel lubrucation or anything else? Any knowlesable member's thoughts would be appreciated. Thanks.