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As Bigspendur already indicated, Tamahagane is a type of steel that is used in Japanese katana. It is of very high quality, but it is also exceedinly rare.

The sale of Tamahagane steel ingots is...

It depends.
If I happened to chance upon a 7/8 tim zowada damascus for 500$ I would pick it up in a heartbeat.
Same for a Tamahagane razor in good condition.

But in those cases I'd only pay that...