This is a 1860's to 1890's No 651 Cap! I wish I could be more precise but I am not sure exactly who issued this hat, however I found one that closely resembled this one which was a 1800's police cap, but also found Grand Army Of The Republic, Fireman's, Railroad Conductor and Civil War Officers Hat as well that bore close resemblance. Sorry but you will have to decide and make your best determination. Be sure to read all condition descriptions. The pictures are a substantial part of the description so please examine all the photos and contact me if you have any questions. We will be happy to save you shipping costs by picking this up at our shop. Thanks for looking.  092121-RK-16