I'd have to go along with Mullet, it's likely an old lemonwood bow. They were very common in the 1940s and 1950s; My first real bow was a well used lemonwood, cost $3.00 with a couple of arrows, tab and bracer back in 1959. I shot it a lot. However, they can be brittle now, cracking or breaking if suddenly drawn. Only you can decide it if you're willing to break it or just let be a interesting old bow on the wall. If you want to shoot it, really want to; try tying a loose string from nock to and gently pull it back a couple of inches and slowly it down. Try it a few times a day, then an inch or two more after a few days. Eventually you'll get back to a draw length of 26 or so inches. So far so good, well, give it shot.
There is alway a possiblity it is dark stained hickory. Ben Pearson made a lot of hickory bows that seem have stood up very well over time. I have an old one that has been shot my me quite a bit in years past but I keep it in the rack nowdays.
Hope this helps, just my opinion and your miileage may vary. :-)