TIMONIUM, MD.- Interest was keener than ever, and the bidding action was relentless in RSL Auctions sale of antique toys and banks held May 22nd at Richard Opfers suburban Baltimore gallery. We started at noon and finished at 20 till three it was about two hours and 40 minutes of very serious bidding, said RSL co-owner Ray Haradin. In all, the auction took in $1.8 million (all prices quoted include 21.5% buyers premium). They came to buy; they didnt want to sit there with an auctioneer trying to milk a few extra dollars out of them, said Haradin. When Rick [Opfer] is at the podium, you put your hand up or you dont get the toy. The featured attraction of the 360-lot sale was the Richard C. Stevens collection, a 24-year assemblage of cast-iron mechanical banks boasting superb conditions and with provenance reflecting several of the most prestigious coll