That tang stamp was used right up until the factory closed in 2004. Not sure what year they started using it, but it
can't be any newer than that.
I thought all of the us made old timers were 1095?
Not all Old Timers with Stainless blades were marked "Schrade +". Towards the end many Old Timers had stainless blades and had no indication of it in the blade stamp.
I think I can expand on that a bit: it depends on the model and age. Some Old Timer models were only stainless and were marked with the SCHRADE+ tang stamp. Other models changed from stainless to carbon, and the changes were generally marked with the SCHRADE+. Towards the end of production, some previously-carbon-only models had reportedly begun gradual and un-advertised transitions from carbon to stainless. And some limited edition or special releases were stainless.
In addition to all of that, Schrade had a long-standing tradition of mix-and-matching blades and knife parts between Schrade, Old Timer, and Uncle Henry knives. At the end of Schrade, in the final weeks as the factory was being cleaned out for bankruptcy, employees were busy assembling, literally, knives made from any parts that fit together.
Should the blade with the worst of the broke tips be turned into a screwdriver?
Those blades aren't going to tolerate a lot of twisting and prying. And Old Timers were 'generally' assembled with the Swinden Key method, making it difficult to repair or tighten wobbly blades. Looking at the picture, yours is an obvious Swinden Key (notice there are no pins visible on the bolsters).
By the way, since no one mentioned it yet, your model is the 8OT (obviously), which is called the Senior Stockman. It was one of the most popular Old Timer models ever (
the most popular was the 34OT) and was in continuous production from 1959 to 2004.