Gives the terminology and dimensions of threads in the following types of back covers and bezels:
Type A —Suitable for WR-1 type watch case. See IS : 10361-1983 Classification of wrist watch cases.
Type B — Suitable for WR-2 and NWR-1 types of watch cases. See IS : 10361-1983.
IS 10362-1982 history
1983IS 10362-1982 Case back and bezel thread dimensions