Charts

Knowledge Base

How to Find a Watch Movement Caliber

Learn how to find a watch movement caliber by checking movement markings, case back information, and internal reference numbers. A practical guide for identifying movements before ordering watch parts or...

Why Exact Measurements Matter in Watch Parts

Learn why exact measurements matter when buying watch parts. This guide explains how small size differences can affect fit, function, and appearance for crystals, crowns, hands, gaskets, and other watch...

Acrylic vs Mineral Glass vs Sapphire Watch Crystals

Learn the difference between acrylic, mineral glass, and sapphire watch crystals, including scratch resistance, impact resistance, appearance, and cost. A practical guide to choosing the right crystal material for repair...

How to Measure a Watch Crystal with Calipers

Learn how to measure a watch crystal with calipers, including how to measure removed crystals, installed crystals, and case openings. A practical guide to getting accurate millimeter measurements before ordering...

Choosing Original vs Aftermarket Watch Parts

Learn the difference between original and aftermarket watch parts, including how authenticity, fit, appearance, availability, and cost can affect the right choice for your repair or restoration.

What Does Jewel Count Mean in a Watch?

Learn what jewel count means in a watch movement, why jewels are used, and whether more jewels always mean a better watch. A practical guide for buyers, collectors, and anyone...

High Dome vs Low Dome Watch Crystals

Learn the difference between high dome and low dome watch crystals, including how dome height affects hand clearance, fit, and appearance. A practical guide for choosing the right replacement crystal.

How to Ask AI About Watch Parts

Learn how to ask AI tools better questions about watch parts. This guide explains what details to provide, how to measure accurately, and how AI can help narrow down possible...

Stop and Call a Watchmaker

Learn when to stop and call a watchmaker before a simple watch repair turns into a larger problem. This guide covers common warning signs, risky DIY situations, and when professional...

Fitment & Sizing

Learn how to choose the right acrylic watch crystal by understanding fitment, sizing, dome height, and tension ring styles. This guide explains how to measure the case opening, compare common...

Charts

General Anatomy of a Watch

Learn the basic external parts of a watch, including the bezel, case, crown, dial, hands, lugs, and more, with a simple labeled illustration.

G-S Round Crystal Size Reference Chart

A quick reference guide showing how G-S round crystal size numbers correspond to millimeter measurements. Useful for identifying vintage GS crystals, comparing parts stock, and helping confirm replacement crystal sizes.

Terminology

Watch Movement Terminology

Learn common watch movement terminology used in watch identification, repair, and parts research. This guide explains terms such as caliber, plate, bridge, train, escapement, balance, barrel, mainspring, and more in...

Watch Crystal Shape Terminology

Learn common watch crystal shape terminology used when identifying replacement crystals. This guide explains round, rectangular, square, tonneau, oval, stepped, faceted, and other common crystal shape terms in plain language.

Mainspring Terminology

Learn common mainspring terminology used in watch and pocket watch repair. This guide explains terms such as barrel, arbor, width, thickness, hole end, slipping bridle, alloy mainspring, and more in...

Acrylic Watch Crystal Terminology

Learn common acrylic watch crystal terms used in sizing, fitment, and installation. This guide explains terminology such as press fit, crystal seat, tension ring, dome height, skirt, hand clearance, and...