Hi Greg, I have a NOS one in the Lycoming box on the shelf in my shop...P/N 53E19600.
I would be happy with $180 for it ($100 off Chief or Superior price) plus $5 for shipping.
If you are unhappy with it when you receive it, return it unused and I'll refund your money minus shipping...
I'm curious... not to sidetrack from the thread... but what's the difference between the older model # and the newer one?
I did a little research and Gary is right...there was a problem with the early p/n in that the lock nut which is staked to the shaft could come loose.
The new p/n has the same construction with the addition of a roll pin thru the nut and shaft to prevent the nut from coming loose.
Therefore, I'm lowering my price to $100 and the buyer can drill, install a small roll pin and save some $$.