[John S.]

Bill:
I can confirm that the RCD collar, with letters "R.C.D." on the lower scroll do exist.
Bill Elms (old time Toronto badge collector) put together a photgraphic catalogue of his badge collection in the 1950`s-early 60`s; I have a copy of a copy of that record, and on plate 109 of the catalogue the collar in question is stated as being "1904 collar".
Hope this helps.
Cheers,
John S.