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@lead farmer said, the steel looks to be in already good enough condition, not much restoration is needed except for a proper grind, that is, if you intent to actually use this; otherwise if this is destined be just a wall hanger, then you can skip that step. $175 is a little high for something that would be provided. I might charge that much if I'm sourcing all of the materials, but f someone were to provide me the head and cover the shipping to me, then I would charge around $125 and that would include shoring up the steel, proper cutting grind and edge sharpening, patina, then hung on a carved, thinly contoured handle.
As to the forced patina, some ways of doing it is more aesthetic, but some also create a protective layer to prevent rust. I do a forced patina by soaking the steel in a warm bath of peroxide and salt, which covers it in rust. I do this several times and evenly brush the rust to spread it, then once satisfied, I'll boil the steel in distilled water which turns the brown rust layer into a black passive oxidation layer. Very similar to boiling water in an aluminum kettle to 'season' it.
You can do this yourself, lots of folks in this thread who can help guide you along the way. Each one you do gets better, and the whole process is very satisfying - and fun! Nothing like enjoying a tall pint of your favorite beverage and listening to some tunes out in the shop for a night of breathing life back into an old toool.
Beaver-Tooth is a good handle maker, though he's a one-man operation, so shipping is slow and often some items are out of stock, so you'll have to watch the page often to get what you are looking for. I would avoid House Handle, I've been disappointed by their quality control more often than I received anything satisfactory. I'm talking sloppy lathe work, hafts not aligned with the eyes, turning down a handle to the thickness of a toothpick because you ordered a lacquer-free handle and they just put a lacquered one on a lathe. Just crap, I'm done with them. Proceed with caution.
If you need some help and or guidance, feel free to message me. I've helped and done work for a few folks on here.