Class "1" Token
The tokens were only 11/16th's of an inch in diameter (about 17 mm).   
The provincial government spent nearly $20 million on the Skyway, three kilometres long on 76 piers. It was the longest bridge in Canada when it opened. Located between Hamilton and Burlington, ON, the steel city of Hamilton never seemed to worry about the bird's-eye view such a bridge would bring. But the city did worry about the name. The Hamilton Chamber of Commerce petitioned the Ontario government, insisting that the water out there wasn't Burlington Bay anymore. It was Hamilton Harbour and the name of the bridge should reflect that. That went nowhere.

The Skyway was built to address Canada's worst bottleneck. Traffic would back up for miles on the Beach Strip whenever the bascule bridge swung out of the way for a lake boat on the canal.  In April 1952, a long sand carrier called the W.E. Fitzgerald did motorists a favour and knocked the little bridge into the water. The Skyway -- debated since the QEW came by in 1933 -- was suddenly on the front burner.

It opened with two lanes in each direction in 1958, capable of handling 50,000 vehicles a day. But you couldn't just sail across. After a 10-day grace period for rubberneckers when the bridge opened, the Skyway became Ontario's first toll bridge and these were the tokens used. 
The Skyway went toll-free at the end of 1973. Supposedly the bridge had been paid for. By then the route was clogged again. In 1984 work began on twinning the bridge. The province said it was changing the name of the Skyway to honour a former transportation minister. That didn't please locals and the compromise was the name "Burlington Bay James N. Allan Skyway". No one calls it that.

The new twin cost twice as much as the old span. Without the pale-green steel arch, it offered none of the original's charm.  Now there are 10 lanes. All in all, a lot of bridge just to let 700 freighters a year steam into Hamilton Harbour.
 Class 3 token
Class "3" Token