Greetings all, I took home a handful of bench chisels to restore and use but have a question for those of you with more experience with this tool.
My question is, for the first chisel pictured below, the backside is no where near flat. I wanted to know whether I should be prepared to hone or down until the entire back face is perfectly flat or if it's okay to just flatten the last inch or so closest to the sharp edge (which is what it looks like was done to this one).
The other pictures are examples of ones from the same haul that were much flatter overall.




Cheers!