OP's gun looks so nice, like seldom shot over all these years. From the serial number alone (N242xx) I would guess shipped late 1971 or early 1972. I have s/n N 24533 that Lettered as shipping Feb 14, 1972.
I only recently found out that mine had been modified for competition (because of the double ball detent yoke lock) after market, so I cannot say for sure but most all of these 25-2'a that I've seen on the Forum seem to have sights like mine, i.e. adjustable rear, Patridge front.
OP's gun has red ramp front and white outline rear. I like the RR/WO setup but was this original to Model 25-2, or could it be ordered optional in early 70's?
OP's grips, and mine appear original with football cutout as it is my understanding that speed loader cutout did not appear until 1973 on N frame guns, does anyone know for fact on the speed loader GA grip availability date?
Color me a great fan of the BMT loader/unloader tool. I just load up 20-25 full moons in a few minutes at home and never lose time at the range.
Mine in factory stock condition has a Single Action trigger pull of 3#-9oz, Double Action 11#-5oz, quite stiff for shooting for me. However setup for competition (by whom or when...I have no clue) this gun becomes a very sweet and very accurate gun even in my old hands. Lightened main spring, polished internals, reduced rebound slide spring, Pachmayr mono grips all work together for SA pull of 2-3/4#, DA pull 6.5#. No reliability probs with the lighter pulls.
OP got hold of a very nice example 25-2, sure hope you come back and give us a range report when you get a chance.