As it happens, I have a new-to-me Fasan Double Slant OC on its' way to me right now. My plan was to use it for a month, so it fits right in with Open Comb Tober.
OK Gents, I just signed in for the October Highlander Challenge and when I saw this I figured i would go with an open comb. So, I'm in with a 1930's Gillette Goodwill New. I just received this razor as a PIF from a member (Mike) when i was struggling to master a Cadet open comb I bought from another member! This OCtober focus will give me a month to dial in my OC technique.
I will give it as best of a shot as I can, there might be a week where I am out due to being part of a pass around box. But I am also starting a week early using my Gillette New this week and will continue to use it for at least most of October.