What this coin looks like (obverse, reverse, mint mark location, special features, etc.):
One major variety is the 1820/19 Capped Bust Half Dollar with a Curl Based "2" in the date. The date features an 1820 date struck over an 1819 date which resulted in a 20 over 19 overdate error. The "2" in the date in this particular variety features a curled and curved base (as opposed to the other variety which has a flat and square base). The difference between the 1820/19 Square Base 2 vs Curl Base 2 half dollar is depicted below in the example comparison image:
Coin valuation chart: Typical coin prices, values and worth per grade or condition - in USD