I would be willing to bet it was changed. Every original master I have seen had bleeders and a code stamped in the boss. To my knowledge there are no reproduction drum brake master cylinders with bleeders.
So its an original master, just not for your car. It was probably a rebuilt unit from God knows when. Code CT is 68/69?
You guys have power brakes on the brain. I can solve this mystery. Power brakes had bleeders manual masters did not. Diagrams are in the assembly manual. He may have the correct one?
I have it from a good source Brett did some dumpster diving tonight! Watch it Brett, you may have some competition. I saw on news some bears have been dumpster diving fattening up for hibernation. Really.
Im confused. Unless Im reading it wrong, which could very well be, the assembly manual shows three codes for masters- UA, TH and RK.
isn't disc EA and drum ( power at least) CT ? never seen those other codes. Brett is your car Manual Drum originally ?
The tag code and the stamp code are not always the same. 70 power Disc stamp is EA as DL posted but I do not think drum.