Need help finding an out of print of a Indian buffalo hunt with a rifle. It was a poster I saw and want a copy

I saw this poster of a Plains Indian using a flint lock rifle, supported by 2 crossed arrows to steady the muzzle end, as the tribal elders looked in doubt over his new technique and weapon. Below the Indians on the hill was a heard of buffalo. I saw the poster several years ago at a flea market and didn't get any info about the poster. Now I wish that I did get the info. I love the print and would like a copy to proudly hang on my wall. It looked like a print of an oil painting if I remember correctly and had an incredible amount of detail. Please include info as to where I can purchase this poster. Or, if you have a copy of the poster can you help with a copy for me? Thanks!