The .45 Basic Brass is what I use for my .45-120 Sharps. It would be a crime to cut them down for .45-70!
Depending on the brand of the brass, the value will vary. Bertram is the least desired, with RCBS, B.E.L.L., Huntington and Norma being more desirable. Jamison International brass was also pretty good.
As near as I can tell from the pictures, your brass is RCBS, so it was made by B.E.L.L. for RCBS when they were in Henderson, NV. The machines for making that brass were sold to PMC in Boulder City, NV, and converted to make 9x19 and .45 acp brass. When PMC in Boulder City went bankrupt and sold the rights to the name to the Korean Company, the machinery was sold to Jamison International, in Sturgis, SD. Jamison ran into some financial problems over a lawsuit, but it's my understanding that there are efforts to open their doors again.
Just buy regular .45-70 brass if that's what you need them for.
Hope this helps.
Fred