Here the watch is ready to be disassembled.
I will be taking apart the balance ensemble in order to measure the balance staff.
The balance staff with the wheel, hair spring, collet, and on the reverse the impulse jewel and roller.
This is the escapement, escape leer and escape wheel. I took this off now to check the motion of the gears for any possible problems.
It is important to record where the position of the impulse jewel and hair spring stud are in order to have the watch beating correctly.
The balance staff end jewels. You can see the crack in the bottom jewel.
Here the crack in the first jewel is more evident.
The end-cap jewel is fine, the break in the jewel occurred when the watch feel at some point in its past history. A new jewel will need to be sourced.
The balance staff. Not visible here, but the hairspring collet is not flush against the balance there is a space. This means the balance staff was previously repaired poorly (as the collet needs to sit on the balance wheel.
Another view of the balance staff top.
Bottom of the balance staff. Not visible here, the balance seat is made of brass, meaning that it is not the original balance staff.
Balance hairspring and impulse jewel and roller disassembled.
The top pivot is the one that is broken, this is visible here as it is visibly shorter than the bottom pivot.
A view of the balance without the roller table from the bottom.
Instruments to measure the diameter of the balance staff pivots. The top is a 1880s gauge, the bottom from the 1960s.
Balance staff measurements in order to turn a new replacement by hand.
The balance staff is riveted to the wheel, a punch is used to extract it.
The poor quality of the replacement staff which is of two parts (instead of solid steel) is visible here, as the seat remained on the balance wheel.
The brass bushing.
The top of the brash bushing was already fragmented, and here it is marred by the punch when I removed the balance.