My Greaves just arrived and its cooler in person! Headed out to grab neats foot for the scales. For its vintage I think it's in great shape. Im guessing 1810 - 1820's but that's just based on similar items I can compare to.
A bit of a wonky bevel and the scratching on the blade makes me believe someone has been after it with power tools. I don't think these are factory marks.

11/16 blade width shy of that at the heel. Thanks for looking gents