That's a cool find. I have about two dozen of the silver ones in my collection although they are not in that good of condition like yours. Some of mine have the broad heads attached .
I have mine packed up right now getting ready to move but mine are short too (27") although the spine is between 50 -55 #. When I unpack them I'll see what they are. I do remember they have the original Ben Pearson Skeletal heads on some of them.
Are the target arrows aluminum or just painted aluminum color. I still have some of my old fiberglass arrows from the 60's. Do you think the case is hand made? I couldn't tell from the picture.