Nick -
You are absolutely correct about the ordinance bomb. So please accept my appolgy for the mis-information as I continue to wipe the egg off of my face. To further my description of the rank chevrons, the chevron you are depicting is that of an E-8 musician. I am not sure as to the actual rank (they are probably the same as the rest of the enlisted paygrades), as members of the President's Own are "contract musicians" that have advanced degrees in music from upscale colleges and universities like Julliard, etc. After successfully participating in a formal audition, they enter the Marine Corps at the equivalent rank of an E-6 pay grade - Staff Sergeant. They do not go through boot camp as all enlisted Marines do at either MCRD, Parris Island, S.C., or MCRD, San Diego, CA. But go through an orientation as to who to salute and when, Marine Corps Customs and Traditions, and what uniform to wear under what conditions, plus intense training in close order drill for the ceremonies that they participate in year round. All of the chevrons worn, from paygrade E-6 through E-9, have the Lyre (not harp) centered between the chevrons and rockers, and are colored scarlet and gold for the Dress uniform as I described earlier. Colors for chevrons worn on the Forest Green blouse and khaki shirts are the same as other enlisted Marines, Forest Green on khaki for the shirts and Forest Green on scarlet for the Class A blouse.
When I got home from work yesterday I started to look through my USMC uniform references. If you can get a copy of "SEMPER FI" by Colonels H. Avery Chenowith and Brooke Nihart, there is excellent color photo reference of the the bandsmens uniforms, both historical and current. On the third plate into the book is an excellent closeup of the baldric worn by the Drum Major showing most of the bullion embroidered insignia embellishments. No help regarding the baton, or mace as you are referencing. I would continue to check the websites for more details on the baton, good reference should be out there somewhere. I'll continue to search myself, as I expect to be able to pick up a casting of your figure should you market it. Almost all of the figures that I have in my collection are those that depict Marines, U.S. and others. So keep on plugging, what I see so far looks outstanding.
Semper Fi - Ron