This Missile Command prototype turned up in the collection of Video Soft founder Jerry Lawson. This version only has 32 variations instead of 34 (missing one variation from the single and two player games) and is missing Rob's initials. It is assumed that this version dates to a time just before the game was finalized and before Rob got around to adding his easter egg.
No initials
Note how variation 17 is a 2 player variation in this version?
This is the last variation, there is not 33 or 34.
Other than that, this proto is the same as the final.