What material wok did I get while thrifting today?
My guess is carbon steel. It's used in a variety of cooking implements, including stuff like woks and  as bread pans. A quick search suggests that carbon steel is often magnetic as you report. 

If it is indeed carbon steel, it benefits from seasoning and ongoing love and care similar to cast iron (lest it rust or deteriorate). Many articles on this, such as this one from thekitchn. 

It's a fun material, and looks like a nice find! I hope you like it!

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