as I work through imaging my collection for a website gallery, I have been trying to add all the data that I can to the page. using
ebay and delCampe listings to find the Gibbons, Michel and Yvert numbers, I have been unable to find any information regarding SG numbers for souvenir sheets. both Michel & Yvert number theirs seperately, as "BL#xx", while Scott just incorporates them into the normal listings.
anyone have a clue as to how SG lists the m/s??