Well, my carb came in today and it is a real hipo carb. It is well used. The plastic secondary accelerator arm is also broken. Also, one of the holes in the foot seems oversized like it may have been drilled out at some time. All in all not bad for what I paid. It has the original tag which reads C6ZF C then B 5JD. 6ZC is stamped on the base. I guess I mis-interpreted the date originally as this decodes to September of '65, fourth week.
I don't know what I am going to do with it yet. I may send it off to be rebuilt and put in on my K-code so I can see how it performs relative to mine. If it makes a big difference, I may sell it and use the money to have mine rebuilt.
What does Pony charge for a basic non-concourse rebuild and how long does it take?
Oh, and I just got an email from the seller. It seems that someone who bought one of the other carbs isn't happy and didn't get the correct carb. Oh well, not my problem. I got the one I bid on and won which was the one pictured.