The AM-1's purchased under the original contract (BuNo's 22257-22355), used the Curtiss electric propeller that had cuffed blades and rounded tips.
The aircraft purchased under the subsequent contract (BuNo's 122388-122437) used the Hamilton Standard prop with squared off tips.
The "C" is for NAS Columbus VA-691/ VA-692. Yellow spinners.
A departed friend of mine flew Maulers with NavRes squadron at Grosse Isle NAS long ago. I always wondered why they had square tipped props instead of the round one I'd always see publicity photos.
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