WWI British canteen just found at swap meet

[themick]

The last thing I expected to find at a northern California swap meet was this:  A WWI British Army canteen, dated 1915.  Picked it up this morning.  All complete and in great condition for being 110 years old.  Check the pictures out.  On the date marking, hard to make out the last two digits, but up close it appears to be 1915.  Does anyone have an idea what these are worth on the market?

 

Steve