Custom Kopis by GGK

My guess is the measurement would be how far into a target will it go. Sounds like 20”. And thanks for using inches. I’m an old American fart that grew up with imperial. Doesn’t help I’m in construction. About the only thing I use metric measurements for is blade thickness. For me, really small measurements like that are easy to understand in metric. Well so much for my mini rant. 😏

Measuring curved blades is weird. I like the Japanese approach of measuring a straight line from the mune-machi to the kissaki, along the spine. Things get weirder with recurve, though. Personally, I measure a straight line along the side of the blade, from point to guard/grip. Bit weird to measure the arc, so yeah, "how far it goes in" is a good metric. Until you start following the curve with every thrust...

That's fine with me. It will look nice with a patina.

Renaissance wax does a pretty decent job of protecting copper. I have used it on several items including bronze,copper,etc.

I have renaissance wax and use it frequently. I have a copper jewelry collection and polish copper on the regular. So it's really no bother if I want it to shine again.