Nice find! I have several early Gerbers in my collection. The early ones can bring good money. Careful of the rust on the carbon steel blade, I use car wax to protect mine.
No sheath i wish pick it up for 25.00 i will try the wax on blade i did not want to do much
to try to clean it the rust is very light must have been in a box sitting for a wile
Get up and go to those yard sales and flea markets!
If you know what you're looking for you can find some great things.
Recently I found a couple valuable handmade swords, an old Baltimore whiskey jug, and a rare antique Natty Boh beer can from the 1940's all for $10 each.
I could put them on ebay and make hundreds of dollars.