Help with issue stamp on 1915 Mk III AND unusual rearsight

[boltaction]

Good morning:
I just acquired a 1915 dated Mk III. It has an issue stamp which I can't identify. It's a RCC/CEF/466 Does anyone know what RCC is for? I have Barry Manarey's old handbook of identification marks on Canadian arms, but its list is incomplete, and there was also some variation in how things were stamped. CC would be Cadet Corps or sometimes Chausseurs Canadiens, RRC could be Royal Regiment of Canada, but RCC?

Also, I'm not sure when we went from the line stamping style to the little CEF in circle stamping, or were those stamping styles used concurrently? A lot of the 1914 dated Rosses; (HMS Canada being the commonest seen of those now) have the circular issue stamps.

Anyone know offhand?

Looking at the rifle more in depth (I just received it) I also notice that it has a rather unusual rearsight. On a very cursory glance it is a standard sight, but in fact it is a smaller version of the regular sight. I have a similar one, but not identical, on one of my target Mk II**'s. Has anyone seen one of these mounted on a Mk III before? I'm wondering if I should change it to a more standard one, or leave it as is. Since it's a highly unusual sight (I haven't seen more than two myself) I'm assuming it must have been put on deliberately close to the time of the rifle's service life. If the rifle was one which was more recently "resurrected" from sporter status, it doesn't seem likely that someone would have a rare sight to put back on it instead of a standard one.........

I also posted this on the Rossrifle.com forum, so if I get an answer there will post it here for interest sake.

Thanks.

Ed

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