How much it's worth is very dependent on where you are and how you are planning to sell it. Definitely at least the $5 you spent, and it could be quite a bit more than that if you're in an area where golden oak is popular. It does have the disadvantage of being a single dining chair -- if it were part of a set it would have more value. i wonder if it's European, rather than American. There's something about the lozenge-shaped press-carving and the shape of it that seems European to me.

I suspect they were occasional chairs from the late 1950's or 1960's. I don't think they are from pre WW II. They aren't Danish Modern per se but the wood has a bit of a feel of Danish Modern influenced furniture. Here is a picture of one of a pair of chairs I inherited from my mother which she bought in the late 1950's/early 1960's. I had them reupholstered. While the style is different, the wood tone reminds me somewhat of them.

As @Jilly wrote the chair is worth $100 regardless of exact provenance. ETA - Of course it may not be "worth" $100 but since the cost is relatively small it doesn't really matter since an equivalent form of seating will cost about that amount or more - or maybe less if one stumbles upon a bigger bargain. At this price level for functional objects that you like and can use it really doesn't matter. An equivalent new garden chair would be much more expensive and that is generally how I determined whether "used furniture" was worth a certain amount. If you like it and can use it then why not buy it If at some point you want to sell it you can research to find out if it is a "rare" valuable item.

When I looked for K D furniture, the information says K D means knock down....or assembly required. I can't imagine the original buyer put those chairs together. Then another search came up with sites, like Wayfair, Overstock, Amazon. Thailand was identified as place of manufacturing. Very confusing. Hope someone out there can straighten it out for you.