Blackbird safety razor

What's your preference for blades on this razor?
My last shave with the Blackbird SB I used a Gillette 7 O'clock Super Stainless (Green) and got a wonderful, smooth, close shave. Personally I haven't found any of my favourite blades to not work in it. I think it was recommended to use a Personna Lab blue in the Blackbird, which is why when you order one, Shane sends 5 of these with the razor.
I have used these, Nacets, Rubies, Polsilvers, Astras, Perma Sharps and 7 O'Clocks (Green and Yellow) all with super results!
 
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