From pages 39 to 50 of the 3637_Bulova Part Number catalog, the content continues the detailed indexing of specialized Bulova watch components. This section is especially valuable for balance regulation, escape mechanisms, and shock system parts. It serves as a core reference for vintage watch servicing and movement restoration.

Key Categories Covered (Pages 39–50)

1. Balance Springs and Regulator Parts

• Extensive listings of hairsprings matched to balance assemblies, sorted by caliber.

• Identification of regulating arms, pins, and blocks for fine adjustment of rate.

• Note: Many entries indicate if overcoil or flat hairsprings are used, which is critical for accuracy.

2. Shock Absorber Components

• Complete parts breakdown for Incabloc, Kif, and Diafix systems.

• Components listed:

  • Shock spring clips

  • Cap jewels

  • Settings and retainer springs

• Each part number is tied to a Bulova movement and illustrated or cross-referenced for clarity.

3. Escapement Mechanism

• Details on escape wheels, pallet forks, and pallet bridges.

• Tooth counts, jewel types (natural vs. synthetic), and fork styles (open, closed, etc.) are noted.

• Some entries specify whether replacements are available as complete sets or individual parts.

4. Additional Internal Components

• Listings include:

  • Setting lever jumpers

  • Crown wheel screws

  • Balance bridge screws and studs

These are particularly useful for identifying parts that are easy to lose during disassembly or that frequently suffer from thread damage.

Technical Usefulness

Watchmakers, restorers, and parts resellers benefit from:

• Accurate part number-to-caliber mapping

• Visual verification (in earlier or following diagram pages)

• Restoration precision for balance and escapement timing integrity

This section is particularly useful when dealing with older or rare Bulova movements where parts interchangeability is limited and reference materials are scarce.

Summary

Pages 39–50 of the 3637 Bulova Part Number catalog act as a deep-dive into escapement regulation and shock absorption parts. They provide a precise reference for restoring the most delicate mechanisms in Bulova watches—especially balance assemblies and anti-shock systems.