Ok, so would a double dome (domed on inside as well) provide enough clearance to use the 6r15?Worth considering: NH35 (date), NH36 (day/date) & NE15 (not available until April 2015 from Cousins) & 6R15, however the 7S26 is 4.9mm high the others range from 5.25 to 5.32 high which may cause the second hand to foul the underside of the crystal.