Sirius/Star OLFs are worth getting your hands of if possible.
If Thunderbirds are more available, and you can find someone with enough knowledge of OLF and Thundy runs you might be able to find what you want that way.
Speaking of...
My favorite S-OLF looks similar to 1.5 runs (white space to the right of the "sirius" tag at the top of the stamp) but its slightly swirly, it has a patent number, and doesnt have the 1.5 run number embossed on the back.
Anyone know what run this is? I would love to dig up more of these, but I'm not even sure what I'm looking for.