The marks on the tang and tail don't have to be related to the look of the razor. It definitely looks to be a shortened regrind to me.
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Something like that, yes.
This loos like a regrind / shortened razor to me.
The fact that there are no machine marks is really not that interesting.
First of all, it could have been done a long time ago, but even then, it would just be finished properly.
If I grind a razor, there ar eno machine marks left by the end either.