is this silver coin canadian?

roughly what year is this?

 

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Yes, it's either KM23 or KM23a, check the weight
KM23 - 2.324g - 1912-1919 0.925 silver
KM23a - 2.332g - 1920-1936 0.800 silver

All I can say for sure is that it isn't 1911 due to 'Dei Gra' being on the obverse

 

Yes, it is, but it is hard to read the date.

 

unfortunately my scale only goes to the tenth place. so 2.3 is all I know. but thanks for the date range.

 

I'm sure it's missing a few tenths from wear as that coin should have been retired .