BEHIND THE WATCH Time will tell

With fashion fans embracing vintage looks, watches from the 1920s to 1950s are particularly hot items on eBay, says Constance White, the online auctioneer's style director. Besides tracking time, some stylish watches have other practical applications. Here's eBay's guide to the terms and functions of watch features:
Calendar: The face of the watch might display the date, day of the week (known as a "day-date watch") and month ("a full-calendar watch").
Chronograph: A stopwatch or meter measures time elapsed. Chronographs can also come in a "split-second" format to measure two time segments simultaneously or consecutively.
Moon phase indicator: Display shows the phase of the moon through an image on a rotating disk.
Repeater: When a wearer presses a button, watches with a repeater announce the time through a series of chimes.
Tachymeter: A scale located around the rim of the dial that, when used along with the chronograph, allows measurement of average speed through the calculation of time and a pre-measured distance.
Telemeter scale: A scale that measure the distance between the watch wearer and an object that generates a visible signal and a loud noise.
Tourbillion: A small but very costly mechanism within a mechanical watch that helps eliminate potential time errors.
Water resistance: Resistance ranges from 0 to more than 1,000 meters in depth. Usually described on the dial or back of the case, a watch's water resistance is measured in feet, meters or atmospheres. Average wa'ter levels are: 30 meters splashproof; 50 meters can be worn in the shower; 100 meters can be worn swimming; 200 meters can be worn scuba diving.
World time: A feature that indicates time in all time zones around the world simultaneously. The dials or face display the names of cities around the world in each time zone and can be adjusted to read the time in that zone.