Can you identify this Cox 049 crankcase? Ever seen one? Got one you would sell me??

I think Jason won that auction.    We'll have to see from him.

Opps! I looked for a thread on it before posting but didn't see one.
Sorry for the duplicated topic.

Did get the information I was seeking though, thanks Jacob.
The engine is in Tim Dannels' & Dan Sitter's Cox Model Engine Handbook.
ECJ #159, page 50

I have the book, had a Homer moment and missed it! 

I bought that engine. It is a beric crankcase. The bottom lug is for the starter spring to sit around. Works pretty good for that. Not sure this ever went into full production. I have never seen one before.

What a great addition to your collection.
Wish I had seen it in time to bid, then again, maybe it is financially beneficial for both of us that I didn't.   
The following is quoted from the Cox Model Engine Handbook:

    "The idea of using a die cast beric crankcase was
developed from 1975 through the late 1970's.
    Beric is a high zinc content metal with aluminum
as the secondary major element. In addition a "lug"
was cast into the bottom of this crankcase. Assembling
the starter spring on the Cox engines, had always been
a production assembly problem. In the process of
wrapping the tail of the starter spring around the
cylinder it was easy to scratch the cylinder's black oxide
coating. Installing the tail of the starter spring around
the lug on the bottom of the crankcase eleminated this
problem. In the late 1970's, after several years of
experimentation, the decision was made to develop a die
cast aluminum crankcase. The result was the ECJ # 96
R/C Bee .049 engine. Several variations of the beric
crankcase engines were developed as follows."

A photo is shown in the book that looks just like the
engine you purchased Jason except that it does not
have the spinner on it and there is a black plastic
knob on the needle valve.