case back
The cover on the back of a watch, which protects its mechanism. The case back is usually inscribed with the watch maker's mark and other information regarding the watch ...
Good: Case possibly with rounded edge detail; may have numerous light to medium surface scratches and some dents; case back opening grooves (if any) possibly with some medium burring.
The best and most accurate way to tell a Rolex from a replica is by checking its Serial#, Model#, Case back ID, ...
A watch bearing the inscription "water-resistant" on its case back can handle light moisture, such as a rainstorm or sink splashes, but should not be worn swimming or diving.
A threaded watch case where the case back is screwed on to attach to provide greater water resistance
Seed pearls
Small, round, nacreous pearls ...
The size and factory number of a particular watch movement. The number denoting the calibre is displayed on the case back of a Pulsar watch and is the first four digits before the hyphen in an eight-digit number.
CASE ...
An extremely durable metal alloy that is virtually immune to rust, discoloration and corrosion. It can be highly polished to resemble a precious metal. Because of its strength, stainless steel is often used to make the case backs for watches.
 See also: Ring, Jewelry, Case, Jewel, Band
  
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