Thank you for your interest. I believe that "Grade-Uniform" applies to my collection in that I am keeping it between XF90 (one 85J) to Sup98 (solid XF/Sup stamps). It has been a lot of fun in the last two years with the C17 being the only stamp I need...the thrill of the hunt. My sets are "Nickel Triumph" in the PSE used Air Mail Registry...nothing fancy. That's it and thanks again for the interest...

Nick