Filmon, The new photo is clearer and shows a sharp impression on the left stamp, which indicates the flat plate printing method. My opinion is that the left stamp is also and example of Scott 610.
Selina, If you are talking about US stamps, if the paper is obviously blue, it is a fake. The best way to determine if your stamps are on the so called blue paper is to send them to an expert service
Keith, Your items are CTS, cut to shape. This was popular for a short time. Common material CTS has no value but then common material in a nice large full corner has little value. Extremely valuable
Craig, Your 3/10/1976 First Day Cover bearing Scott number 1683 has a current catalog (retail) value of $1.00. The US Postal Service officially canceled 662,515 First Day Covers on that day in Boston
Hello John, Thanks for the question and welcome to this fun world of stamp collecting! The issue of gum vs. no gum is one that has been going on for a long time. I try to live by one simple philosophy