this category mainly focus on early wristwatches in enamel dial, they appear in many case construction, such as half hunter, full hunter, borgel, hermtic, semi hermetic, full hermetic, 8 days, direct read, chronograph, calendar, officer trench, left hand, 3 pieces oyster case etc.
examples in the picture is a 9k beautiful enamel cushion by rolex, NFS.
very rare 18k full hermetic, excellent enamel dial
this is a very important piece of art in the wristwatch history, a piece which is designed to prevent the elements of dust, mositure from aking the watch non dependable, not a commercial success, therefore not many survive, expecially in this extra nice condition.