I for one have no idea what various Guns sell for in Chile, nor what the Laws are there for private transactions in Firearms, so...can't help you on that part.
You could see about carefully removing the Stocks ( 'Grips') making sure you have a well fitting right-size Screw Driver for unturning the Screw and not messing up the Screw Slot or surrounding area.
And post some images of the back sides of the Stocks, and, some clearer close ups of the front sides...and, we could maybe give you some opinions on the Stocks.
The relatively low value of Smith and Wesson K-Frame Revolvers of any age, when in poor cosmetic condition, is simply a reality of the Marketplace.
They were and remain very high quality Revolvers, and, if in good mechanical condition, are very reliable, and are still a high quality item intrinsically...regardless of cosmetics.
Poor cosmetic condition combined with poor mechanical condition, of course would mean a very low value, often less than $100.00 far as anyone stepping up and buying one.