O.T.

I found a really great old sword at an atique mall yesterday. It is a 1864 ( stamped ) decorative fraternal sword.The Knights of Pythias, to be exact. I did a bit of research on it and found out a little bit. They go anywhere from 50.00 - 500.00 + . It has some really intricate engraving, I mean REALLY intricate. It has a lotta tarnish on it, but all of the fittings are in good shape and nothing is damaged. The leather on the handle is even very much in tact. I paid 20.00 for it. My question to everyone is this... should I clean up the blade and the fittings? There is no rust, just tarnish. I'm not sure if I can do the fittings justice, but I know I can clean the blade up easily. I'm not really worried about the monetary value, but I don't wanna decrease the value if I don't have to. What do you guys think?Lemme know what's good.

O.T.