If that is 1870's, its LATE like December 1879 in my opinion. I would say it is closer to around 1880-82 or so based on the photography as well as the uniforms and equipment. Not a really big difference but I dont want you to think "1870's" means early or mid decade because there actually is quite a big difference between an 1872-75 era photo and one from the early 1880's which are MUCH more plentiful.
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