1876 tang sight?
i managed to find a winchester 1876 oct barrel in 45-75 for a customer of mine, i just did the looking he did the paying and talking to the guy. well today my customer called him to see if he got the gun shipped and he had already. he also told him that he had a original(maybe not to that gun, but a winchester) tang sight for one that was "selling for 700-800 dollars" as he put it that he would sell to my customer for 600. my question is, i dont know enough about this old stuff to have an opinion, is that tang sight really worth 600 dollars(i dont doubt it, i just dont want to see him ripped off is all), and if the gun didnt have it originally does it really add that much value to the gun? i mean if you take a 5000 dollar gun and put on an old winchester tang sight will its value neccasarrily go up 600-800 dollars, or is it just kind of a "bonus". any thoughts on this are appreciated as always, i would especially like to hear berts take on this as he is so knowledgible on the subject.