Thanks to everyone for all the compliments on my Oak Leaf Bowie. The credit really goes to Mark Banfield its creator.
By the way, I should have mentioned that Mark Banfield hails from Newfoundland, Canada. I studied the work of at least 200 knife makers before choosing him to create my "Dream Bowie".
Before using brass for the guard, pommel, and mounts, I did quite a bit of research on preserving brass and found out a number of tricks that work.
Firstly, never use Brasso or any other polish containing ammonia to clean and polish the brass. The ammonia in the cleaner actually promotes corrosion and tarnishing as well as opening up micro-cracks in surface of the brass which prevents it from retaining its sheen.
The absolutely best brass polish is precipitated calcium carbonate, an ultra pure form of chalk. You make a paste with water and use it like any other polish. It works wonders. Then coat the brass with Renaissance Wax and gently buff. You will have beautiful shinny brass that won't tarnish for a long time.
Attached is an excerpt from an article from the Henry Ford Museum on how they maintain brass on priceless artifacts .