Thanks Mark!

You prompted me to take another look at the number, and I now realize that the seller gave me only 5 digits and the reference table shows that there should be six. While I clear this up with the seller, let's assume that he left the last digit off.

I was wondering if a SN within 1000 would be close enough to be good, or if Heuer purposefully began at 291000 for this model. Your response helps clear that up.

: Well, the serials should be 6 digits by then, but I'll assume they
: are. The serial number ranges shown in the table are from a
: sample size of just over 500, comprised of various Heuer models
: rather than just Autavias (though said list has more Autavias
: than anything else in fact).

: So treat it as the lowest and highest serials that we know
: of rather than a hard and fast rule. A serial in an adjacent
: 1000 is generally nothing to be concerned about, it just extends
: our known range. There are some instances where a low number
: might not be right, like the Chronomatic launch watches, but for
: a general model like this I would say you just broadened our
: range :)

: I did the same exercise for the Carrera table (also with >100
: serials recorded, like the Autavias) and found some really good
: correlation for a lot of the models. Not to say that won't be
: refined either with a greater sample size of serial numbers.

: Adding this serials column was a great idea of Jeff's, I'm sure
: he'll be pleased it's already being used!