The last production Browning Superposed rolled of the line in 1987. Today they are made in limited numbers by their custom shop at a premium price. Here is a list of the production years and serial numbers.
https://www.browning.com/support/date-your-firearm/superposed-shotgun.html
Is it a good choice for skeet? Sure, why not. Most skeet ranges limit your ammo to 2 3/4" 7.5, 8 & 9 shot and many of the Superposed are only chambered in 2 3/4". As long as it's in good condition with a low round count and tight lockup...you should be fine. Before you buy it, see if you have a competent gunsmith look it over. Bring them with you to the gun shop for a quick inspection. Knowledge is power and you need to be armed with as much as possible when looking at a used firearm.
BTW - Is it only skeet or is it skeet, wobble, trap, 5-stand & sporting clays? If so, you should be looking at a "sporting" shotgun. If you want to hunt birds and small game with it, a "field" model shotgun would be best. The length of barrel, LOP, weight, weight distribution, features and stock shape are different for field or sporting shotguns...you need to know the difference. Take a look at these pictures as an example. They are both 725's but that only describes the action...everything else is different. Same goes for the Superposed.
Browning Citori 725 Field
Browning Citori 725 Sporting
That's not to say that a sporting gun can't be used for hunting but walking though the fields with a 8.5 to 9 lb sporting shotgun designed to absorb recoil from hundreds of rounds in a single day will make you quite tired. You should have a shotgun that is designed to be carried more than it's shot with quicker handling and a more open grip that weighs around 7 lbs. Think of it like taking a benchrest rifle on a mountain goat hunt. It will work, but each one would be better with it's own rifle.
Now if you are asking if there is a better option for skeet than the Browning Superposed, you just opened an entire can of beans and I'm not sure there are enough words available to me at the moment (still having my first cup of coffee) to fully explain it.
The best advice I can give is take a look at what you want to do, and go from there. If you want to be good at hunting, get a field shotgun and go to the skeet range with the intent on getting good a breaking clays so you can drop birds on your next hunt. If you want to be good at the game of skeet (or any of the others), buy a sporting shotgun and if you do go hunting press it in to service as necessary...or buy another shotgun for that purpose.
If you have more questions or if this post sent you into a tailspin with the volume of information that's out there, don't sweat it. Send me a PM with your number and we can talk about it. I'm sure we can narrow down your search with just a short conversation.