Information on Keen Kutter 1150

I recently purchased at an estate auction a Keen Kutter Razor. I have found lots of info on the K1150 but can find nothing about this one. It has Keen Kutter in script on the blade and Simons Hardware Co Germany 1150 on the tang. There is no print on the back side. Any help as far as mfg dates, value, or any other info. would be greatly appreciated. The other razors that I have in my collection are a M. E. Reppenhagen "Diamondine", a Shumate "Safe Guard" and an Oxford razor Co. Thanks in advance for any info.