The Schrade 8815 was replaced with the 881, 1955 to 1986 and all had carbon blades.
The very early 881s had bone handles. [I do not know when they stopped the bone handles]
An 881 with stainless blades came out in a display tin in a clam-pack, maybe in the 1990's ?
My every day user, has a match-strike pull and Delrin handles - I bought it new in 1973.
I have about six new 881s in tubes, and would guess, they were made around 1970 to 1973.
Although I have a large number of later 881s - all of them look to have been sold in bulk, as they came in grease and plastic bags [unopened] lone nail-pull, tang stamped N.Y. and not Walden like the early ones.
Can you post photos, that always helps... Ken
This is two 881s on the left and two 8OTs on the right.
I would guess they were all made, around 1969-73?