In the early 1970’s Citizen used a range of different materials in their watch cases and bezels. The black PVD coatings began to appear and that soon became an established finish for many sports style models. But Citizen also used some rather more exotic materials, including wood and agate, typically encasing a 6500 / 6501 movement.
My example this week is not quite so unusual as wood or stone, but it does use what I believe is a tungsten bezel. The case is marked ‘BLTI’ which suggests a black case with titanium bezel, but my research suggests that the metal used was in fact tungsten:
The gold dial lies behind its original horizontally faceted crystal:
After some cleaning the bezel is more like it would have been when first produced (apologies for not cleaning off the lint on this pic!):
The back is marked in typical fashion, and shows production was in October 1972:
The 21 jewel movement runs at 21,600 beats per hour:
This is an example of the kind of design which emerged in the early 1970’s – not necessarily to everyone’s liking of course, but nevertheless evocative of the period when more traditional design conventions were challenged.