It isn't O1 as O1 was never used for saw blades. It may be L6 or 15N20, either of which is a good blade material, or it may be something else entirely. If the blade is 3/8" thick then I doubt that the teeth have been tipped with carbide but if they have then the blade is likely useless for knives.
Aside from checking for the carbide tips the best way to know is to cut up some coupons and use them to figure out how best to HT that steel. Start with the basic treatment you would use for 1084 (non-mag and quench in warm oil). If that doesn't harden it then it is likely useless. But, if it hardens and the grain looks fair then try a few different temperatures until you find what works best ...
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