I "found" this in the safe while looking for something to sharpen on my Wicked Edge sharpener. This is probably the oldest knife I own - can't think of any older. The "PG&E" is the company I work for and the two red stones indicate I got this when I had 10 years with the company - now I have 32. Every 5 years we got to pick an anniversary gift out of a catalog and this was by far the best thing for only having 10 years. LOL
It has a 2 1/4" blade, is 6" overall when open, has wood inlaid into the brass and as you can see I used this knife a lot, probably until I got another at 15 years. I lost the 15 year one so I'm really glad to have this one, brings back some memories.
I did sharpen it on the Wicked Edge and hoooweeee is it sharp!
I have a similar, slightly larger Gerber lockback I received for finishing first in a training class I took in 1978. About 4.5" when closed, 8" open, and 3.5" blade. Mine is mint (except for tarnished brass) as I've never used it "in anger" as it has a nice engraving on it.
One of my main EDC knives is a Gerber Silver Knight, the single blade variety. I like the clean style and relatively small size which I can carry even in dress pants. I've managed to snag several new ones on eBay so I have different slab varieties, MoP, wood, and their checkered plastic. I think the vintage of these is similar.