What would be the rough price of a FJ25 like this in the states?
Saw your question and thought I'd respond here instead of "cluttering" the other thread.
Unfortunately there is no set "rough" price because so few examples like yours exist to compare. Unlike the '76-'83 FJ40 market in which at any given time numerous examples in various conditions exist for sale constantly and people constantly want them, the '58-'62 or so market is almost non-existent. Sure, the really old ones pop up for sale from time to time, but they are typically in rough shape, missing a lot of parts, greatly modified, don't run, etc., etc.
It's kind of circular problem: There is not a big market because there are not a lot early cruisers for sale. So how do you price them?
Clearly the great selling points of your cruiser, should you decide to sell, are its originality, relative completeness (it is missing a few things) and overall good condition. That it runs and is apparently road worthy doesn't hurt either. Getting a U.S. buyer to complete the purchase while the cruiser is still in Chile, however, could be a challenge.
Ultimately you'll have to just advertise everywhere and often if getting top dollar is your goal. Try eBay with a high reserve to gauge interest and bid amounts. Not sure what they would give you for it, but the FJ Company in Columbia might be interested, although it would almost certainly be restored and resold by them for $75K or more. For the exposure, and amusement, you could also start a "what is it worth thread" in either the 40-55 "tech" section or the FJ40 vehicle for sale section here on the forum. The FJ25 classified section doesn't get much traffic, and frankly, I doubt anyone here would give you top dollar. Although I am always willing to be wrong.
I am thinking that the "right buyer," someone who has been wanting an "original" example FJ25 and understands how rare yours is would pay in the neighborhood of $20K, maybe?
You will want to confirm with photos that it does have its original engine block, and somehow prove that the paint is original. Maybe shine the whole thing up too!
All the best.