The Crown Graphic Special came with the 135mm f4.7 Xenar from the factory and sold for $20 less than the Crown Graphic that came with the 135 f4.7 Wollensak Graphic Optar. The only difference between the standard Crown and the Crown Special is the top lens board lock and the lens/shutter they shipped from the factory with.
Due to production tolerances one may perform better than the other in a technical showdown. Test them with the camera on a tripod, ground glass focused with a loupe, and wide open. One may produce images that you like better.
I can CLA either shutter for $75 + shipping.