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Dating flat glass thickness. Display glass / flat glass thickness | micro-epsilon -

A flat-thick crystal is definitely the right choice for many early size watches.

Display glass / flat glass thickness

Watches with original American bulls-eye crystals tend to be popular with collectors and often sell for premium prices. In Geneva, or hunter style, crystals the hardest crystals to replace are: Hunter-style crystals tend to be quite thin and fragile, and vary from almost flat to slightly convex, but all must be low enough to allow the metal case lid to close.

Whereas all the other crystal styles we've talked about are convex domedFT crystals are flat, or very nearly flat, on top. Some contend that it was to magnify the view of the watch, or direct more light onto the dial, but these theories don't seem to be supported by the empirical evidence.

Common Crystal Types and Styles

Sizes virtual dating page 17 in lignes, the archaic system in which old crystals are measured.

Expect to pay more for old-stock glass crystals in these tough-to-find sizes, as we are dealing with a very limited and dwindling supply of original vintage glass crystals. Finding replacement rounded high-dome bullseye crystals is nearly impossible these days.

Some of the toughest sizes to replace these days in open-face crystals are: Open Face Beveled Edge Crystal Watches that have no case-lid over the dial of the watch are called "open-face". Sometimes there is VERY little clearance and finding a crystal that fits properly can be quite difficult.

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Typical glass thickness for an open face flat-thick crystal is 3. Original crystals for vintage pocket watches were typically made of mineral glass, and came in a wide variety of shapes, thicknesses and styles.

Hunter Style or Geneva Crystal If the watch has a hunter-case with a metal cover over the dial and crystal then the watch uses a hunter-style or Geneva-style crystal.

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Beveled edge crystal for open face pocketwatch Open Face Smooth Edge Crystal Open face crystals can also be smooth-edge or rounded-edge as shown below. As watches grew thinner, and as thinner watches became more stylish and popular, more attention was paid to a smoother transition between the crystal edge and the bezel.

They have a flat spot ground into the center of the crystal which gives them a "bulls-eye" appearance. Also called "Double Lunette with Cut Top" in the early watch material catalogs.

Display glass / flat glass thickness | Micro-Epsilon America

We can replace MOST but not all vintage pocket watch crystals. Many vintage pocket watches have open face crystals with a beveled outer edge, as shown below. Replacing Broken or Missing Crystals At Renaissance Watch Repair, we have a large inventory of old-stock glass pocketwatch crystals in a wide variety of sizes and styles, including one of the largest inventories of American Bullseye crystals you'll find anywhere.

Open Face "American Bullseye" Crystal These are similar to the English high-dome bulls-eye crystals, but they are much less domed and saw a brief return to popularity in the early s. Again, this was purely a stylistic choice.

How Display Glass is Made

If the bezel is missing, there's no way to install a new crystal for more info on cystals and bezels, read here. The beveled edge was purely a stylistic choice, and gives the watch a crisp, sharply defined outline for the dial.

My personal opinion is that it was simply a matter of style, and that they came into vogue in aboutand went out of style in about We'll show you the more common styles and a couple of less common styles and provide a little information about how they were used.

The bulls-eye on these later crystals is usually concave whereas it is flat on the early English style. Typical glass thickness for a hunter crystal is 0.

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Typical glass thickness for an open face smooth-edge crystal is 0. That doesn't mean it's made of crystal, but "crystal" is the correct name for it.

These crystals have a thick, pronounced beveled edge, which almost gives them a magnifying glass effect.

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Based upon our observations, smooth edge crystals tend to be found on thinner, size "gentleman's watches". Some believe it to be a mark left when the pontil rod is removed from the crystal during the manufacturing process, but there are many examples of smooth, concave glass objects from that time period which don't show a pontil mark, so that theory may not hold up.

For crystals sizes that were common across a wide variety of case brands, stocks of vintage crystals have been nearly depleted. There is much debate among horologists as to the origin and purpose of the bulls-eye mark.

This is a great reason why you NEVER shut a hunter case watch with your big ol' thumb pressing right in the middle of the cover Flat-thick crystal for open face pocket watch English-Style High-Dome Bullseye Crystal These high-dome crystals are typically seen on early English fusee watches.

Hard-to-Find Pocketwatch Crystal Sizes Why are the some of the most common pocketwatch crystal sizes getting harder and harder to find?

Pattern Glass

Typical glass thickness for an open face beveled crystal is 1. Since there are no contemporary sources for vintage watch crystals, old-stock supplies are all we have left. In order to replace a missing crystal, the watch's bezel must be present.

Railroad pocket watches look great with beveled edge crystals. One of the challenges of fitting a replacement hunter crystal is that it must be high enough to not touch the center arbor or interfere with the hands, and low enough to not interfere with the case lid.

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There are some sizes we can no longer obtain in old-stock glass, and in those situations the only option is to use a modern acrylic crystal instead.