Bill,
Here's a post on another site about Harold Groves which I found interesting:
"Harold Groves made great bows in Albuquerque from the 1950s until he died in 1997.... His pre-stress system was designed by the top scientists at Los Alamos Labs, where Harold worked as a machinist. They did it as a stress-relieving fun project. Harold was adamant that the "eggheads" deserved the credit for designing the bow. The result was the fastest recurve bow ever made. Today if you can find one, you can expect to pay from $200 to $500 or more, depending on the model and the condition. They haven't been made since 1998...shot in a tournament two weeks ago in Scotland with one, and the other guys couldn't believe the speed and smoothness of taking the shot. Harold's daughter, Sandy Burbridge, has compiled a book about Harold and the Spitfire bow."
BTW, I found one of his target bows recently at a garage sale which was 28# at 28" and 66". It has a whopper of a riser and makes a Bear Tamerlane feel like a featherweight.
Is your bow one of those so-called "dynastressed" models?