Late '50's early '60's Ben Pearson Stallion Semi-recurve.
As the nomenclature states, it is 66" long. and 55# @ 28" draw.
It was a really good hunting bow in it's day. If it is in solid shape it should still be a good shooter. String it up easily and test the draw a little at a time, listening for any strange creaking, groaning, or cracking sounds.
If it stays together without making bad sounds, you can then try to shoot it.
Just remember to NEVER shoot it without an arrow nocked up.
You have a keeper, and probably a decent shooter.