This gives a good overview on the characteristics of the Bancroft Flighter (from a site that sells repros):
There are many differences between original Flighters depending on when they were produced.
Traits of early war Flighters:
•Dark gold satin lining in OD #51 caps; khaki satin lining in Khaki #1 caps.
•Heat stamped Flighter logo on sweatband.
•The words “BY BANCROFT” below the sweatband logo (pre-May 1943) and “BY BANCROFT Visor Pat. Pend.” (post-May 1943).
•Red, white, and blue diamond shaped label on satin lining (also in some late war Flighters).
•Plain, unfinished leather on the underside of the visor.
•Sweatband color is usually tan.
Traits of mid-late war Flighters:
•Yellow, tan/silver, and olive drab satin lining in OD#51 caps; yellow satin lining in Khaki #1 caps.
•Gold or silver (rare) embossed Flighter logo on sweatband.
•The words “BY BANCROFT U.S. PAT. NO. 2369275” below the sweatband logo (post-February 1945).
•Black printed circular label on satin lining.
•Underside of the visor is finished with a piece of suede.
•Sweatband color is usually a dark shade of russet brown.
In addition to these differences, there are others such as the style of mohair braid, color and size of the metal eyelets, pattern of ventilation holes in the sweatband, and interior construction of the caps. To make things even more confusing, the original caps were often manufactured at times using two different styles or patterns of certain materials simultaneously (i.e., only the diamond shaped red, white, and blue labels were used on early war caps, but this style of label also appears randomly on mid-late war caps).
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