Could someone please assist me with any information pertaining to this uunused Philippine/US stamp Jose Rizal 2 cent dark green ( Philippine Scott241) with over print expressing "Guam Guard Mail" in red with gum in back? Does this stamp overprint come in different color overprint other than red? Does the overprint have different markings that makes one more valuable than another? For example, with Hawaiian overprints, a dot or missing dot after last letter in overprint may make a difference with assessment of stamp. Is this the same with this specific stamp? What is the Scott # for this stamp?
This stamp was next another unused stamp of the same denomination in Philippine page within International Junior Stamp Album which I purchased recently. It has three areas noted on this specific stamp: Philippines, United States, and Guam which makes me wonder if this stamp may have value. Any information would be truly appreciated. I have not seen this overprint before on this stamp before. Thank you in advance.