Also in my recent eBay purchase of a collar bag and 7 assorted Early 20th Century men’s linen starched detachable collars is an “Ancover” collar, somewhat similar to the “Amolak” previously posted.  It too is clearly post 1899 because the Cluett name that is stamped is Cluett, Peabody & Co.

You can reproduce this type of collar making a pattern from one of these scans.