In the photo of the 3 Maces seen here, the bottom is an SA, the middle is an MR--but I don't know who the top Mace is. It's larger than the others--the neck area is especially elongated, with correspondingly longer buttons. Feel free to PM me with info if you'd prefer not to discuss in public.
I have a photo of the larger Mace in pieces too:
I have a photo of the larger Mace in pieces too: