Ken,
In that case you have a Fox .07. I bought the engine new when they came out in the mid/late nineteen fifties so no modifications have been made.
The .049's shown are the FAI version. I do not have the standard .049, perhaps it looked more like the .07. My GUESS is that they may have used the same crankcase on the standard .049 and the .07. That way they could just burnish off the .049. Perhaps someone has pics of the standard .049.
George