From pages 31 to 38 of the 3635_Bulova Part Number catalog, the document continues to provide an in-depth listing of mechanical watch components, with part numbers keyed to specific Bulova movement calibers. This section serves as a technical reference for identifying exact replacement parts for repairs and restorations.

Key Sections Covered (Pages 31–38)

1. Mainsprings and Barrels

These pages begin by listing:

• Complete mainspring barrel assemblies

• Separate mainsprings (with torque specifications, inner/outer coil diameters, and thickness)

• Compatibility by caliber (e.g., 10CL, 11AFAC, 11DP)

These entries are essential for determining winding power output and fit for each movement type.

2. Escape Wheels and Pallet Forks

Detailed information includes:

• Escape wheels by movement and finish (standard steel or jeweled types)

• Pallet forks and arbors

• Associated part numbers for the bridge or cock if uniquely paired

Technicians rely on this to address beat errors and escapement issues during overhaul.

3. Train Wheels

This includes:

• Third, fourth, and center wheels by movement

• Indexed by tooth count and pinion type

• Differentiated by jewel hole sizes in newer vs. older versions of the same movement

Matching exact train gear profiles is critical in maintaining proper timekeeping.

4. Jewels and Settings

• Hole and cap jewels listed separately

• Press-fit vs. friction-fit distinctions

• Oil cup presence indicated

This section aids jewelers in replacing cracked or worn bearing surfaces, especially in vintage pieces.

5. Balance Assembly

While balance wheels are briefly introduced, most details point users to dedicated pages for:

• Balance staffs

• Hairsprings

• Shock settings and Incabloc-compatible parts

The catalog provides reference part numbers even for different shock absorption system versions (Kif, Incabloc, etc.).

Summary Use

These pages serve multiple roles:

• Watchmaker reference: Ensures the correct replacement of intricate parts

• Inventory identification: Helpful for matching drawers of old stock to movement families

• Restoration accuracy: Allows collectors and repairers to retain original performance specifications