Most of the old wood bows that are still around are lemonwood. Like Charlie said, grain is almost impossible to determine - which is a dead giveaway. However, unlike Charlie, I've had decent luck saving these old shooters. Start by rubbing it down with lemon oil once a day for 3 to 5 days. Then (like Pat said) re-educate them slowly bending just a little at a time until you can get back to full draw. Go slowly and give it as much lemon oil as you can each day. Most were very forgiving and accurate bows.