Seems a pretty comprehensive and well thought out list there Paul.

Perhaps it might help if I ask some questions from a diver layman's perspective. And I'm deliberately doing this just from looking at the spreadsheet, without looking at pictures to put a face to the ref, for reasons which should become clear as we go along. Worth noting that I'm not saying anything is wrong as such, just that I found Jeff asking these sort of questions helpful when putting the Carrera table too. Here goes, with your family group for reference up front:

The Family tree is as follows:

Heuer Diving Watches

- 1000 Series (automatic & Quartz) + (28, 32, 38 & 42mm case size)
- Super Professional (844.006 + 840.006)
- 980.003 + 980.004 (Day date with crown at 4)
- 980.023 (1000m Quartz crown at 4)
- Ladies (981.058 + 982.058 + 983.058 + 983.048)
- 2000 Series ????????????

The main thing that strikes me as I look at the table (in the latest form I have it) is how many of the watches begin with the 980.xxx reference. With the 0 changing occasionally to indicate case material as we are familiar with from the 70s references for chronographs (0 for steel, 1 for black or olive PVD, 2 for pewter PVD and 3 for gold-plated... or black PVD in some cases. And in others the 0 doesn't change even though the case material has, Black Coral models for instance. Hmmmm, not as consistent or as useful a marker as it is in the chronos. Shame.).

Does 98X.xxx not constitute what comprises a 1000 Series watch then? Why have we pulled out the day/dates and the deep dive watch into separate families? And does the 983.048 not belong to the day/date family just as much as it does the ladies watches? There might be reasons related to the case etc, it could just be a nomenclature thing, but it looks to me (from a spreadsheet, remember, I'm not looking at pictures) more like these are branches of the 1000 Series family (if indeed that is what 980 signifies) than families of their own. This can work well within Jeff's OTD formatting - take the first generation Carrera, where we have 12, 45 and Dato sections. We could have, within the 1000 series section, a "main watches" section (with someone hopefully finding a better name), a "day dates" section and the "deep dive" section (with its whole one model in :) I like the name deep dive for it though). Might not be appropriate in the metal, but it feels like a natural grouping to me.

Which brings me to the Ladies family. I know this just comes from having these watches left over and trying to find a name for them, I guess, but I see lots of other ladies watches on the list and those, I presume, will be sitting under the 1000 series? If these don't fit under the 1000 series as I'm asking above, it might be better to cop out and have a "Miscellaneous" group with these in rather than potentially giving the impression that these 4 are the only ladies watches in the range?

Looking at the spreadsheet, it also strikes me that we have a few orphan references (orphan in the sense that they don't conform to the same 98N.xxx format). 840 and 844 are the most obvious, forming your Super Professional family, but where does that leave the other orphan number, 756? This seems to be the ladies version of the 844, does it belong to the Super Professional family too?

Potentially gives us just two families (1000 series and Super Professional), perhaps with the need for a Misc category (and ignoring the 2000 series elephant in the room of course). We then have sub-families within those families (if we take day-date and deep dive, for instance) and for at least some of the watches, different executions over time (cf. 844), just as we do for the chronographs.

I'm quite happy for you to explain just why this is all a load of half-baked nonsense, just saying how the watches seem to fall together to me from the data I have and the outside perspective :)