Blade of unknown steel. Should I (try to) harden it?

(...)Maybe I forgot to mention that I was in a very remote location (a far away little village in Patagonia), so I guess the "buy a good steel for 20 bucks" and "send it to HT" pieces of advice didn't apply to me at all. My bad for not letting you know.
(...)
You should talk with @PEU , I think he's in Buenos Aires, and may be able to tell you what steel is available locally. You should be able to find at least 4140.
 
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