Is the riser large like a 70's target bow, like a smaller recurve 59-62 kodiak, or like a longbow? This will help with the age.
If its longbow like, its pre 1959. If like a smaller recurve handle, 59-62, if BIG, 63+.
These have a VAST value range. If its higher than 40#'s, its usually pre 59. Higher poundages become more rare as the bow models progressed to target bow status.
No big deal on the coin, you can find them.
If you can get a picture, I can tell you what it is if 59 on...I don't follow them before that.
Each year 59+ had its own riser wood, shape, etc.
Example, the 61 was awesome zebrawood. The 62 brazilian rosewood, etc.