What is the value of a 1950 US quarter?

1950 is not a rare date for most US quarters, unless they have a recut mint mark (see below).

Washington quarters were made of 90% silver from 1932 to 1964; in lower grades the coin's value is mostly determined by the value of the silver it contains - about 1/6 of a troy ounce. Currently they are worth about $5.50 based on silver content.

Look on the back of the coin to see if there's a small mint mark letter below the bow in the wreath. It may be blank or there may be a D or S.

Numismedia lists the following approximate retail values as of 01/2013:

No mint mark (Philadelphia):

Uncirculated - $10.00 to $425.00 depending on quality

"D" mint mark (Denver):

Uncirculated - $10.00 to $387.50

"S" mint mark (San Francisco):

Uncirculated - $10.00 to $3160.00

Recut mint marks:There are two rarer varieties that have re-cut mint marks. One has an S cut over a D, and the other is the opposite. Any coin that seems to have a recut mint mark needs to be authenticated by a certified dealer or appraiser.

"S over D" mint mark:

Very worn - $31.05

Moderately worn - $51.75

Slightly worn - $80.50

Almost no wear - $2,820

Uncirculated - $390.00 to $4090.00

"D over S" mint mark:

Very worn - $28.75

Moderately worn - $49.45

Slightly worn - $69.00

Almost no wear - $205.20

Uncirculated - $270.00 to $23130.00

DISCLAIMER: The retail values quoted are the best available as of the date shown, but may vary due to market fluctuations. Also the wholesale (buying) price of a coin will be less than the selling (retail) price. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.