What a steal for $20!
When bidding on lots, you can assume that most of the coins in the lot are worthless junk, with maybe 5 valuable coins per 100. Here's what I am seeing in your lot:
Silver Canadian coins (everything silver-colored minus the nickels from before 1968)--George VI and Elizabeth II are pretty much worth melt, while George V and earlier carry a premium.
The Victoria silver-colored coins are most likely all silver, and her coins usually carry a premium.
That Japanese 50 sen coin is probably silver and could be quite valuable; can't find a match online.
The bottom "cash" coin is a Japanese Mon from the 1800s or so. Very common and worth a couple bucks. Top one I think is Chinese, but can't quite make out. Probably Qianlong; his coins are crazy common and very cheap.
You can find the country in Google by typing the legend on the coin exactly as it appears. I see mexico, peru, philippines, UK, hong kong, iceland, taiwan, australia, Germany, etc. Most of those are worth face value, or have been demonetized. The coin with the building and "10" is a Japanese 10 yen coin. Those still circulate and are the rough equivalent of a dime.