Somehow, I'm not rightly sure they got the idea from your CPF post last September since the SF wrist light already had a model with a watch at last year's SHOT show in January :thinking: :
http://miltechrev.com/2012/02/02/shot-show-2012-lighting-and-accessories/
Looks like the watch version has the HCP (high canon pinion) Harley Ronda 715 movement, hopefully the five jewel variant found in the more expensive Trasers like the P6506. Less expensive Trasers and most current Luminox 'Navy Seals' watches use the one jewel Ronda 715 movement from the few that I've looked inside. These watches need HCP movements due to the thickness of the hands with the tritium vials attached. I believe the watches on the SF wrist lights are manufactured in Switzerland by MB-Microtec AG, not sure if that still qualifies them for the 'Buy American Act' (41 U.S.C. § 10a–10d).