U S Cavalry Picture/Postcard Circa early 1900's

Here is a very nice picture of what appears to be US Calvery on the march in the early part of the 1900s.  I have no idea if this is a picture or postcard.  There is nothing on the back - on the front it says copyright mark by Underwood Sunderwood NY.  Edges are frayed and corners have been bent.  It is 4 3/4" x 3 3/4"

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