The bowyer was named Harold Groves - was never much of a player in the industry, don't think I ever ran into one back in my youth when I was shooting recurves. Unfortunately, they have very little value. They are likely 60's vintage bows. 63# is fairly stiff - you won't find it easy at all to shoot unless you are familiar with traditional bows. I shot a 60# compound before hanging it up and going traditional; I currently shoot a couple of 45# recurves, I don't have any trouble with a good 50# bow but at 55# I tire pretty quickly and I've been shooting traditional for a couple of years now. I guess my point is take it easy, it's really easy to develop bad habits when you are over-bowed. I would examine the limbs closely for any signs of separations, twist etc. If all looks well I'd get a new string and a stringer (unless you already have one) and then draw it back slowly, if all looks and sounds well back to full draw then I'd go ahead and shoot it a bit and see how it goes. I really like 10 Ring Strings, Allen does great work and is very fast; get them with his string silencers as well. Hopefully someone will be along who can give you more details - like I said I shot recurves in my teen years back in the early 70's and have kicked around on a few of the traditional sites since coming back to them so I know about enough to be dangerous. Hope it works out for you; I'd be curious to hear how you like them.
Here is the link for Allen:
http://www.tenringstrings.com