What is this rim from?

[PeteVS]

I have a couple of rims, 15" x 5" wide and the good old 5 on 5-1/2" bolt circle. They have "nubs" on the INSIDE of the center stamping for the hubcaps to snap INTO and I'd like to find another. I don't want one with spring clips or one with the "nubs" on the outside of the center stamping that the rims snap onto. If any of you could tell me the year and make that this rim was made for, I'll stand a better chance of finding one. Thanks!