Zenith El Primero Lady 36'000 VPH

Brands so often try to sell you a bill of revolutionary innovation or the ultimate this or that, that when a brand comes along with a seemingly modest goal, it's quite refreshing. For Elliot Brown, a new UK based watch brand, "It’s about doing things just a little better". Founded by Ian Elliot and Alex Brown, both veterans of the affordable watch industry, Elliot Brown is not trying to reinvent the wheel, nor are they trying to prove every other watch brand wrong. Their goal is simply to ........

Friend just picked up a Navatimer (?) with a slide rule. He got it off the big internet auction site, he's not a WIS but he didn't taken too badly. Long story short, no instructions. I did some digging for him and it appears to have what they call the inverted sliderule, C CI scale (?). Any and all help would be appreciated. I realize being a WIS the model # would help, so I'll see if I can come up with it if need be, thanks.........