Technical Data TD 101 DIRECTIONS FOR REMOVING 18/0, 20/0, AND 21/0 SIZE MOVEMENTS

Hamilton issued about 30 technical documents (TD’s) prior to WWII. The company released one each time they produced an innovation. I haven’t found the entire series. I’m guessing from the titles that a later TD caused Hamilton to revoke a previous one. For example, we haven’t found TD 105 & 106. If we find those sheets, we’ll insert them. I hope you find these helpful. Meanwhile feel free to download the entire series from 1930 to 1948. Hamilton Technical Data (Bulletins).

The download is free.

Technical Data
TD 101
DIRECTIONS FOR REMOVING 18/0, 20/0, AND 21/0 SIZE MOVEMENTS FROM TWO-PIECE CASES

1. A round-faced, knife edge case opener is most desirable for small case work.

2. The balance wheel and case lip is located under the numeral 12. Bring case opener in contact with case lip.

3. A close firm grasp of case and case opener will prevent slipping and make the work more positive. A quick snap will separate upper and lower part.

Click on image to enlarge

4. The movement is held friction tight in lower part of the case.

5. The balance wheel iş located in the movement directly under the numeral 12. Lift this end slightly.

6. Protect balance end of movement with the first finger and lift the opposite end as shown.

7. Grasp the stem, shift the movement up and down in the case to equalize the friction that holds it.

The movement will gradually rise up and out of the case.

The 18/0 size movement has now been removed from the case.

Hamilton two-piece cases are scientifically designed with accurate bezel, extra heavy side walls and reinforced bottom piece. The movement size and case opening are finished to standard and uniform sizes, eliminating the necessity of shaving the side walls of the case to fit the movement.

The movement is held rigid in its place without the pressure of the top piece,

The results of this accuracy in case construction are:

Dust proof cases.

Cases will not spring open accidentally.

Movements held rigid.

Crystals fit more accurately.

Cases easily opened and movements removed.