It depends by what you mean "best". If you are buying them simply for the silver content, just get whatever is cheapest. If you are going for design, Silver Eagles and silver maple leafs are some of the more popular ones.
It depends on what combination of coins are used
The current price of silver is about $17/oz
EBAY !
Some American Eagle coins include Uncirculated Silver Eagle, Proof Silver Eagle and American Eagle Bullion coins. You can purchase these coins online from the Golden Eagle Coin website or from eBay.
It hasn't; Mexico still mints "Onzas Plata Libertad" (Freedom Silver Ounces), with some 1.2 Oz of .999 pure silver. Such coins can be purchased at any banking establishment for some 250 pesos (USD$18.66).
Silver is worthless compared to platinum. 40 oz x $17 = $680 for the silver. A single ounce of platinum is over $1400.
Gold bullion coins are made from precious metals called bullion and minted into coins. These coins are traded on the commodity market and usually come in 1 oz, 1/2 oz, 1/4 oz, 1/10 oz, and 1/20 oz sizes.
.0185 oz ASW (Actual Silver Weight) according to 2012 Standard Catalog of World Coins
The melt value of Longines Symphonette sterling coins would depend on the current market price of silver. Sterling silver is typically composed of 92.5% silver and 7.5% other metals, so the melt value would be calculated based on the weight of the silver in the coin. To determine the exact melt value, one would need to weigh the coins and then multiply the weight by the current price of silver per ounce.
Four 40% Eisenhower dollars= a little more than 1 & 1/4 oz of silver.
Yes, if they are high in silver content. You may also want to consider a gold and silver buyer. Stagg's Coins & Precious Metals 317 W Meeker, Kent, WA 98032
The only "$1" coins struck in 1990 were 1 oz silver bullion coins made for investors and collectors, and they carried the famous Walking Liberty image, not a portrait.