I'd love to find a nice example of the non-luminous, single pusher, symmetrical case Lemania chronograph as issued to Royal Navy Sailors (apparently for those serving on nuclear subs). I have a black faced asymmetrical single pusher RAF and I've come to really love the single pusher mechanism and interesting design. I've gotten intrigued by the high-contrast non-lume cousin. The I believe the full non-lume NATO reference was: 6645-99-924-3312 I've included a good photo of three variations thanks to this great thread on MWRF: http://www.mwrforum.net/forums/showthread.php?14677-Royal-Navy-Submarine-Crew-Timepieces. I'm most interested in the symmetrical case versions. Thanks to the OF family for any leads, or offerings! Cheers, Nick