http://www.fratellowatches.com/tbt-leon ... onographs/
http://www.onthedash.com/Guide/_Chronog ... undeswehr/
http://brown-snout.com/horology/article ... hr_chrono/
http://www.onthedash.com/pages/kk.shtml
http://ninanet.net/watches/others15/Mediums/mheuer.html
http://www.woundforlife.com/2015/04/06/ ... nograph-2/
Some good reading all ways wanted one since I first read about them at the MWR forum a lot of years ago when I saw one at the Pasadena NAWCC regional for sale right after I spent my money on a vintage Omega Speedy then I had to have one and got the one below some years ago a good bang for the buck even now think I paid 1800.00 for it now 3000 and up depending on condition still a good buy you will all ways get your money back or make money if you hold on to it for a few years.
