Byrd is essentially a brand of Spyderco made in China. I think Navy is the one FT has (or had) that looks a lot like the Byrd lines. Enlan also has some Spyderco-ish blades.
Sal Glesser said SanRenMu did some work for Spyderco, but he never said what. Many people guess it was/is the Byrd line. As far as I am aware though SRM doesn't really make any Byrd or Spyderco looking knives (save for
SKU 2132001), at least not for sale here anyway.
Edited on 9/3/2015 at 12:29 PM. Reason: