Most people buying their first automatic watch are not short of options. They are short of a way to tell the options apart. Two watches can look nearly identical in photos and be very different things to own.

This guide covers the handful of details that decide whether you will still be wearing the watch a year from now, and a few you can safely ignore.

Know What an Automatic Asks of You

An automatic watch has no battery. A weighted rotor inside the case swings as your wrist moves and winds the mainspring, and the mainspring drives the hands. Wear it most days and it keeps itself running.

That comes with a few habits a quartz watch never asks of you. Leave an automatic in a drawer over a long weekend and it will stop. The Ironside 200 carries a 42 hour power reserve, so a watch taken off on Friday evening will be still by Monday morning. Getting it going again takes a minute. You wind the crown, set the time, and put it on.

It will also drift. A mechanical movement is a set of springs and gears, and every one of them gains or loses a few seconds a day. The Miyota 9015 in the Ironside 200 is specified at minus 10 to plus 30 seconds per day. If a figure like that bothers you, a quartz or mecha-quartz watch will suit you better, and that is a perfectly good reason to choose one. We explain the trade in why we chose a mechanical movement.

Ask Which Movement Is Inside

This is the most useful question for a first purchase, and the one a lot of listings make hard to answer. A brand that is proud of its movement names it. A listing that says "Japanese automatic" and stops there is asking you to take the rest on trust.

A named movement lets you look up the specifications yourself. You can see how many beats per hour it runs at, how long the reserve lasts, whether it hacks, and whether you can wind it by hand. Hacking means the seconds hand stops when you pull the crown out, so you can set the time to the second. A named movement also tells a watchmaker exactly what is on the bench when the watch comes in for service years from now.

The Ironside 200 runs the Miyota 9015, with 24 jewels, 28,800 beats per hour, hacking, and hand winding. Turn the watch over and you can see it working through the sapphire caseback. We wrote a full breakdown of the Miyota 9015 if you want to know what those figures mean on the wrist.

Check the Fit Before the Features

A first automatic that wears badly ends up in a drawer, and a watch in a drawer stops. Two measurements tell you most of what you need to know. One is the case diameter. The other is lug to lug, the distance from the tips of the top lugs to the tips of the bottom ones.

Measure a watch you already find comfortable and compare. The Ironside 200 is 39mm across, 46mm lug to lug, and 12.2mm thick, which sits flat on most wrists and slips under a shirt cuff. If the lugs on a watch reach past the edges of your wrist, it will look and feel too big no matter what the diameter says.

Then look at how the bracelet adjusts. A bracelet that needs a jeweler to resize it is a small annoyance, and small annoyances are what stop people wearing a watch. Ours adjusts at the clasp with no tools, and our guide to sizing a bracelet at home walks through it.

Read the Water Rating and the Crystal

These two details separate a watch you worry about from a watch you forget you have on.

For water, look for the rating and for a screw down crown. The Ironside 200 is rated to 200m and has a screw down crown, which covers swimming, surfing, and time below the surface. A watch rated to 30m is splash resistant and little more, whatever the number suggests. We go through the ratings in what 200m of water resistance means.

For the crystal, the word you want is sapphire. Mineral glass picks up marks from door frames and desk edges, and they add up quickly. Sapphire is far harder to scratch, which is why a watch that has been worn daily for years can still look new from the front.

What You Can Stop Worrying About

Very high jewel counts, exotic case coatings, and limited edition numbering will not change how a watch wears on an ordinary Tuesday. Neither will chasing the thinnest case or the longest power reserve on paper.

What does matter is whether the brand stands behind the watch. Look for a real warranty and a way to ask questions before you buy. Every DeMarco watch carries a two year warranty, and we answer our own messages.

If you want to see how all of this comes together in one watch, take a look at the Ironside 200.