I am sure there are others who know much more than me. It was introduced in 2012 as a piece reimagined from the 50's/60's Deep Sea Alarm dive watch style of what might have been (not based on a prior real reference). It was a contemporary take of the retro style (including plastic crystal) but using a modern JLC movement 751. I do not believe it was a limited edition, but rather had a limited production run circa 2012-2013. Funny thing is, although I adore this watch (and its modern 3 register deep sea chrono equivalent which debuted a short time later) it does not seem to get a lot of love.