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Mark II Watches

Comparison of the RAF Seiko Navigators (Courtesy of I. Fogden)

Dimensions	Early Model	Late Model
• Case height:	9.0 mm	9.5 mm
• Case diameter:	38 mm	38 mm
• Case length:	44 mm	44 mm
• Lug width:	20 mm	20 mm

Movement:	15 jewel quartz 7/A28A	Unjewelled quartz
Case material:	Stainless Steel	Stainless Steel
Luminous material:	Promethium	Promethium
Functions:	• Tenths of second register • 30 minute register • Split second function	• 30 minute register • 24 hour register • Date function


Other:	The earlier model has 3 chronograph pushers, the latter 2. The crown is positioned at 8 o'clock on the earlier model and 3 o'clock on the latter. Believed to be the first military issue watch manufactured by Seiko since World War II copies of these issue watches are widely available in the U.K. A notable idiosyncrasy of the earlier watch's chronograph function is the register at the 3 o'clock position. This sub-dial measures tenths of a second. This register actively indicates the tenths of a second that have elapsed up until 10 minutes have passed. At this point the register stops actively measuring time. However, once the chronograph function is stopped the hand will move to the correct position indicating the number of tenths of a second that have elapsed.