Not at all. Remember, Philadelphia didn't start using a P mint mark on halves until 1980, so all Philadelphia-issue halves will be "plain".
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The coins are referred to as Walking Liberty half dollars and regardless of year or mint marks from 1940 to 1945 the values are the same at $8.00-$9.00 for circulated coins
The US Mint did not produce any Walking Liberty half dollars in 1932.
Walking Liberty half dollars in average circulated condition dated from 1940-1945 regardless of mint marks are valued the same at $8.00-$9.00 only coins with light wear have higher values.
Average circulated Walking Liberty half dollars from 1940 to 1947 regardless of Mintmarks are valued at $14.00.
Please check your coin again. The Walking Liberty design was used on HALF dollars during the 1930s, but there were no half dollars or silver dollars minted in 1930 due to the Great Depression.