Other members have given lots of good information and advice, especially DON'T CLEAN the medal.
But I don't think anyone has mentioned the number of 1866 bars awarded to the St.Thomas Troop of Cavalry, which was actually 13. (Source: Ross Irwin.)
Compare this with almost 400 awarded to the 2nd Queen's Own Rifles, and you see that you have a fairly scarce medal.
This affects value, as some collectors of the Canadian General Service Medal focus on obtaining as many different units as possible and will pay a premium for a rarity....they may never see another.
Cheers,
Blackswan
