Hamilton Khaki Field Titanium 42mm Blue vs Grey! WHICH would I choose? H70545540 or H70545550

Hamilton Khaki Field Auto Titanium 42mm H70545540
Grey titanium case with a (calfskin) leather strap. Fixed grey titanium bezel. Green dial with luminous black hands and Arabic numeral hour markers. 24 hour markers. Minute markers around the outer rim. Dial Type: Analog. Hamilton Calibre H-10 Automatic movement, based upon ETA C07.111, containing 25 Jewels, bitting at 21600 vph, and has a power reserve of approximately 80 hours. Scratch resistant sapphire crystal. Pull / push crown. Transparent case back. Round case shape, case size: 42 mm, case thickness: 11.45. Band width: 20 mm. Tang clasp. Water resistant at 100 meters / 330 feet. Functions: hour, minute, second. Khaki Field Series. Casual watch style. Watch label: Swiss Made.
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