The 834 is an old pattern that predates the number change in 1947.
The old model number for it was 8343 prior to 1947.
I don't know how far back the pattern goes prior to 1947.
It was apparently a popular pattern because it is the pattern on which the 34OT, (Old Timer) is based.
The 834 was made until 1983. The 34OT was introduced in 1964 and made until Schrade closed in 2004.
That makes it one of the longest running patterns in the Old Timer line. Only the 8OT & 108OT were made for more years than the 34OT.
What is the name on the tang stamp? Is it Schrade or Schrade Walden?
If it is Schrade, it would have been made after 1973, up to and including 2004.
It the name is Schrade Walden it would have been between 1947 & 1973.
Perhaps if you post a picture of it & include the tang stamp, we can narrow the date range a bit.
I hope this helps,