This is a vintage US Army hot weather field cap, more commonly referred to as the baseball hat. It is size 6 3/4. The DSA number is not dated, which I think puts it in the mid-1960's time frame.
The hat has been used, and the inside is discolored somewhat from sweat and dirt and there are a few faint whitish stains on the front underside, but the outside is very good with no stains and not rips or holes or snags. There are no odors. 

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Sold as-is. Returns not accepted. 

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