Yes, it was (is) VO5, similar to putting a thin coat of oil over the brass. Haven't tried this myself, as I don't seem to have corrosive sweat, and/or I just don't play enough.
Also, it's doubtful that your logo is brass - I think the ones that look like that are actually bronze. It's a little hard to believe you have major tarnish problems here, so I'm thinking you might be more disturbed by the need to polish other stuff (bridge, nut, tailpiece?).
Depending on what your other hardware looks like, you might consider a surface mount silver logo, which looks more like pewter, and might be more like $100? However, I don't think Alembic ever ships logos, so any change there is likely to mean a trip home.
Gold has some advantages, if you like the look, though it's expensive to start with, and has a tendency to pit over time. By looking at the the custom quote generator, you could get an idea of what various plating options would cost, though there would probably be some extra charge to get them prepped and such.
-Bob
