Received a pre-owned Newmark 6BB today. It's a re-issue of a watch issued to the RAF in the 1980's. The gentleman who bought the rights to the brand recreated the same dimensions and dial as the original, but the re-issue has removable spring bars and is powered by a Seiko Meca-Quartz movement. It has a plexiglass crystal. BTW, the C-3 lume is impressive.