The blue cardboard box is later production, my edu-guess (Charlie?
@ncbqguy ) after Jim (Conway) moved his operation to Arizona and/or moving the manufacturing to China. Con-Cor circa 1970 was a little more conservative about going all-out foob other than the nonsense schemes on U50s.
Ian's eBay find is typical of the late '60s packaging. I had only seen the green version as well. However, I wouldn't be surprised at all that Jim was trying to scoop the market by imagineering a black PC scheme on the (then Kato) model before the greenifying of the Pennsy, etc., was fully fleshed.