Maybe unbelievable, but they definitely had a sample with the wrong spacing as was shown, so I guess the alternative theory would be that they tooled it up knowing it was wrong to make a one of for a bit of jeopardy? I know which scenario I find harder to believe.
Point taken, but I'm pretty sure (although may be wrong) that the RR 9F is from the original 1971 tooling, maybe a bit ambiguous. Wouldn't be the first instance of dodgy VO in the show though!