I thought Schrade Walden was an old stamp, but this seems like a recent knife:

[screened porch]

So I'm confused as usual.
For those who can't see my dropbox pictures, this is a single-spring pen knife with a clip main swedged on both sides and a pen secondary. Seems like hard black plastic handle covers. SCHRADE/WALDEN/NY USA on the shield side of the main, 708/STAINLESS on the other.

 

[thawk]

That knife is probably from the 60's or early 70's.

 

[screened porch]

Thanks.
I was aware of UH and OT, but not of these "open stock" knives that were made alongside UH and OT. (I had better luck this morning with google.)
These were in the catalogues from 1952 to 1979, and I expect you're right on the money with the date.

 

[lwt210]

The open stock Schrades are my favorite knives to seek out.

 

[screened porch]

This one's certainly a beauty.