This comes from the TM 9-1575 (TM=Tech. Manual) War Department "Ordnance Maintenance Wrist Watches, Pocket Watches, Stop Watches, and Clocks" and includes descriptions of those authorized timepieces during this period of time. The manual is dated 6 April 1945. All pocket watches currently used are standard American manufacture, 16size, of the open face type, mounted in either a snap or screw back and bezel type case, or a combination of both. All wrist watches are all standard American manufacture and are 10 1/2 lignes, 8/0 and 6/0 size. They are all of the open face type and are now being issued in waterproof cases. Hamilton Pocket Watch. Only one Hamilton pocket watch is issued. It is 21 jeweled, 16 size, Railroad grade, model 992B, with the prefix "OE" ahead of the serial number on the exterior back of the case. The case is of the screw back and bezel type; the dial is white porcelain, with black Arabic numerals to indicate the hours and small black numerals on the outer ring of the dial indicating each minute, with each 5-minute graduation indicated by red a numeral. (my note: Montgomery dial) The hour, minute and second hands are of blued steel. Elgin Pocket Watch There are two models used, the 7 jewel and the 17 jewel. Both watches are 16 size, mounted in a combination case with a hinged snap type back and snap bezel. The 7 jewel watch has the prefix "OA" before the serial number and the 17 jewel has the prefix of "OC". Both watches have porcelain dials with the hour graduations outlined in black and filled with RADIUM luminous material. The dial of the 7 jewel watch has red Arabic numerals on the outer circle of the dial which indicate each 5-minute graduation,(my note: not a Montgomery dial) whereas the 17 jewel watch has small Arabic numerals to indicate each minute graduation. The hour and minute hands are also coated with RADIUM luminous materials, making it possible to tell time in the dark. Both watches are stem wound and stem set. Waltham Pocket Watch There are two models used, the 9 jewel and the 17 jewel. Both watches are 16 size, mounted in open face screw back and bezel type cases, with a short pendant. The ordnance markings on the exterior back of the case are "OA" for the 9 jewel and "OC" for the 17 jewel. The dial on both watches have the manufacturer's name and the number of jewels indicated just below the twelfth-hour graduation. The dials are white porcelain with the hour graduations outlined in black and filled with RADIUM luminous material. The hour and minute hands are also coated with Radium luminous materials making it possible to tell time in the dark. Both watches are stem wound and stem set. Wrist watches: Hamilton Wrist Watch There is one Hamilton wrist watch issued, the model 987A, 6/0 size, 17 jewel. This movement was originally issued in a cup type case but is now issued in the waterproof type. The ordnance marking on the exterior back of the case has the prefix "OD" before the serial number. The hour dial is graduated in minutes; and Arabic numerals indicate the hours. The seconds dial orbit is graduated in seconds, with 10 seconds divisions indicated by numerals. The hour numerals and hour and minute hands are coated with radium luminous material for night use. The second hand is blued steel. Elgin Wrist Watches Three Elgin models have been issued, all 8/0 size, having 7, 15 and 16 jewels. The 7 and 15 jewel standard watches are the same in construction, the difference being in the number of jewels and the ordnance markings on the exterior back of the case. The 7 jewel watch has the prefix "OD" before the serial number and the standard 15 jewel has the prefix "OC" before the serial number. The 16 jewel (Hack) type A 11, differs from the standard Elgin wrist watch in that it is equipped with a water proof case, a sweep seconds hand, and a black dial. Although they are normally issued to the Air Corps as a navigation watch, some have been issued, however, to ground troops. The ordinance marking on the exterior back of the case has the prefix "OFA" before the serial number. The 7 and 15 jewel watches come in cup-type cases and are now issued in waterproof cases. The hour dials are graduated in minutes and Arabic numerals indicate the hour. The seconds orbits are graduated in seconds, with 10-second divisions indicated by numerals. The hour numerals an the hour, minute and sweep second hands are coated with a radium luminous material for night use. The seconds hands are all of blued steel. Waltham Wrist watch There are two Waltham wrist watches used as service timepieces, the 6/0 size, 9 jewel, 10609 and the 6/0 size, 17 jewel, model 10617. The manufacturer's name is printed on the dial. The ordinance serial number and grade is marked on the exterior back of the case. The prefix "OC" before the serial number will identify the 9 jewel, and the 17 jewel models are indicated by the prefix "OD" before the serial number. NOTE: THE 6/O SIZE, 17 JEWEL IS NORMALLY ISSUED AND MAINTAINED BY THE AIR CORPS. BOTH OF THESE WATCHES ARE NOW ISSUED IN WATERPROOF-TYPE CASES. Bulova Wrist Watch The Bulova wrist watch, model 10 AK, 10 1/2 lignes size, 15 jewel movement, may be identified by a black dial with the manufacturer's name on it. It is a waterproof case, stem wound and stem set. The case is of the screw-back, sealed with a rubber washer and dust cover. The bezel is formed as an integral part of the case ring and is equipped with an unbreakable crystal. The movement is secured with a case ring and is not held in the case with screws. Elgin Stop Watches Several types of time-interval records and stop watches have been issued. All models except the Elgin stop watches are obsolete. It is used to indicate minutes, seconds, and fractions of a second. Elgin Stop Watch, Type B, Class 15 (long and short pendant) There are two types of Elgin stop watches authorized to all branches of the service. They are open faced, of the plain timer type. The movements are 16 size and have 7 jewels. They are of American manufacture and may be distinguished by the long and short pendant and the manufacture's name on the dial. The Elgin stop watch, type B, has a 7 jewel movements and is identical to the standard Elgin 16 size. It has an additional stop works mechanism located under the dial. The major movement is a continuous running movement. When the stem plunger is pressed the first time, it allows the connecting pinion to mesh with the seconds wheel, which starts the seconds hand in motion. Pressing the plunger the second time disengages the connecting pinion, and the seconds hand immediately comes to a stop. Pressing the plunger the third time allows the hand to return to zero. The Elgin stop watch, in addition to a main dial graduated in fifths of a second, has a minute recording orbit divided into 30 one-minute graduations. In recording longer intervals than 1 minute, minute wheel in motion which, in turn, pushes the minute recording wheel one space. The minute recording wheel in moving one space will register 1 minute on the minute recording orbit. Message Center Clock M1 The message center clock is mounted in a hardwood carrying case. The clock movement is of the 8-day type, fitted with an 11 jeweled watch movement. The dial has a black background, with the name "CLOCK, MESSAGE CENTER, M1" outlined in white. Clocks of later manufacture have Arabic numerals running from 13 to 00 and a double hour hand so that it may be used with the 24-hour system of keeping time used by the armed forces. Note about this manual: This book has complete diagrams of all the timepieces in this serious as well as explosive view with all parts showing, location of parts and function of each. It also includes complete repair information as well as trouble shooting. regards Tim Sweet http://www.tritco.com/most/most1.html