Goes beyond a simple mistake. The cyphers have been discussed previously in this forum.
http://www.britishbadgeforum.com/for...enadier+guards
The vendor needs to correct the description as it certainly isn't a CEF cap badge.
Given the resources available, there's no excuse for an incorrect listing for this badge.
In another listing, the same vendor shows that they don't understand what a hallmark is.
http://www.ebay.ca/itm/WW1-CEF-ORs-C...kAAOSwjiFZYpJ~