Hi Richard, in my ignorance I confess that I had never heard of "guide lines" on stamps, so I have trawled through my collection, and found these three. Hope I'm right ...
My US-collection is a pretty limited one,missing all expensive stamps and containing many sub-standard stamps,more than of any other countries I collect. I like satmps with guide lines,as well as all part-perforated ones. 1 C. no watermark 1,2 C. double lined watermark