Do open sights add value?

[Shooter22UK]

I wont buy a gun that does not have or cannot be easily fitted with open sights, I prefer to have both open and scope/red dot on my gear.

[Mark Palmer]

From a point of value, an older gun missing it's original open sights should be a reasonable bit cheaper than a complete one, bearing in mind the open sights arent always available and seem to command high prices.. should you wish to obtain them later, I'd allow between £30-60 as an average to locate a set, however some may be even more, do your research before you commit