Pretty much everything. Cockade and eagle appear to be reproductions, better close up photos would tell. Markings are not genuine nor correct configuration for the date. General construction is wrong. To be more exact only helps fakers. Looking at genuine examples is the best way to know, and there are good examples to be found with searches here.
I agree with John, practically everything is wrong with this cap; materials, general shape, insignia etc.. One needs to do some homework (research) before collecting rare field caps as most examples encountered are reproductions.
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