Try posting this on !malefashionadvice@lemmy.world

It’s not “universal” but there is definitely standard size, and any shop would have spare wristband. Moreover, very often, the point of failure isn’t the wrist band but the piece that connects it to the watch. It’s something that any jeweler can replace within 5 minutes

Yeah, find an online store accessible to you such as Amazon and measure the width of your old band. You can then search 18mm watch band for example and they should have a bunch of choices. I usually get third party ones because they work just as well as original bands.

Sometimes watches like casio have special connectors but even then you can find replicas that work just as well.

Also just because the watch band says it’s for a smartwatch doesn’t mean it won’t work with a normal watch. Look closely at the photos/measurements and sometimes it’s just a normal strap you can use on any watch.

I can recommend “milanese” watch bands. It’s like tiny chain mail and very long lasting.

Generally speaking, you can get your watch band width just by going to the store page for the watch you have. If not, this is one of many reasons why everyone should own a pair of cheap digital calipers. Measure your watchband and round off to the nearest standard size.

At which point, you are now only really having to care about the pins that connect to the watch. Many (most?) will have a little push button on the inside of the watch band. Depress/slide that, and then you can pop the old band off and the new one on. Some might use the same kinds of pins as watch links where you just need to pick up a watch repair kit (specifically the tiny hammer, a push pin, and a block to hold the watch vertically) which you can generally get for less than ten bucks and watch a youtube for how to use. Pretty much essential if you like metal wristbands/links, but also good to have in general.