Hi Chris, great work on bringing this back from obscurity! Have you had a look here-
There even seems to be sibling to yours in the article.
: Doing a bit of research into my Dad's watch, he bought it in 1971
: and it sat in a drawer for decades. I recently had it fully
: serviced by Heuer's vintage division ($ouch), trying to figure
: out as much about it as I can. It's a pre-Viceroy (S/N 2228XX)
: and has the non-Tach bezel, but it has a lot of the Viceroy
: details (same hands, same 1-12 sub dial). I have the original
: sales brochure and the manual, it was purchased in a Nassau duty
: free store while my dad was on holiday there. Anyone know
: anything further about this particular model?