CWC G10 navigator
From Chronopedia
CWC quartz G10 Nav's with the date window were issued in both lume (6645-99-5417362) and non lume (6645-99-5417363) (for use on nuclear subs).
Lume examples have been seen in 80, 81, 82, & 96 without prefix and 94 & 97 with the RM 0555 prefix.
Non lume 80, 81, 96 and possibly 90.
