10 Dollars - Elizabeth II Montreal Skyline

The 1973 Montreal Olympic series was Canada's first foray into collector coin programs tied to a major sporting event, launched to help offset the staggering cost of hosting the 1976 Games — a budget that ultimately ballooned from an initial estimate of $310 million to over $1.5 billion. This $10 denomination was the higher-value piece in a paired release alongside a $5 coin, both struck in the same sterling silver specification across two distinct varieties distinguished by water line presence beneath the skyline motif.

The two KM references collapse what collectors actually want to know: the "a" and "b" varieties correspond to the with- and without-waterline die states, the latter considerably scarcer in original mint packaging.