If you bought it from an estate sale that was the belonings of the deceased, then it meant something to him to keep it this long. So that could say something about the bourbon.
What are we saying, late '60's to early '70's?

If it was a 750ml, you could get at least $35.00 on ebay.
But for that much, I'd hang onto it for a while, but I would eventually drink it.
If it was for corporate gifts, it might have come from a honey barrell.