The catalogs are not particularly kind to this coin. It contains 0.455 troy ounces of silver, and the value lifts off basic silver value especially in fully, absolutely uncirculated condition. Circulated coins, like the on in our picture, are worth a few dollars over basic silver value (see below).
Use a website such as kitco.com to look up current silver values. If, for instance, silver is selling at $15 US dollars per troy ounce, the base value (BV) of the 1935 crown is 0.455 x 15 = $6.80. Retail prices for these coins are roughly:
worn: BV + $10 US dollars
average circulated: BV + $12
well preserved: BV + $20
fully uncirculated: BV + $50
These are retail prices a collector would pay to buy the coin. If you have one and want to sell it to a coin dealer, he or she would probably pay about one-half of the retail price.
A few proofs were issued, and they are valuable ($600 catalog value), and 28 coins were issued in gold. Proof coins are struck especially for collectors and are encased in plastic as soon as they are produced - never being exposed to friction or fingerprints. See if you can find one of those in the original casing!