As on the first Mark II, the tachymeter scale is printed on the underside of the crystal in order to protect it from blows and abrasion. But unlike the tachymeter scale on the older model, this one glows in the dark. To accomplish this, transparent numerals and markers are printed on a black ring on the crystal. Underneath is an aluminum ring coated with Super- LumiNova. The tachymeter numerals and markers shine through the transparent portions of the scale. The hour and minutes hands are also coated with Super-LumiNova, as is the arrow-shaped tip of the central chronograph hand. The time and the elapsed time are easy to read on the original version of the Mark II so these displays have been altered very little. One change that has been made is the addition of a date display. It is located at 6 o’clock and is integrated into the elapsed-hours counter, which can tally up to 12-hour intervals. The sapphire crystal is also a new feature: the original model had a mineral glass crystal.
The bracelet was upgraded by adding a concealed extension piece, patented by Omega, which is integrated into the clasp. It allows the bracelet to expand in approximately two-centimeter increments each time you press a button on the inner surface of the clasp. You can lengthen the bracelet by nearly 10 cm. Despite this handy feature, the wearing comfort of the Mark II could be better. We found the case to be somewhat top-heavy, and the raised seahorse insignia and Speedmaster lettering engraved on the caseback caused some discomfort.
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