US Scott numbers 658 668 MNH blocks of 4 set of stamps. 663 has 2 gum spots on back. I don't think they are old hinge remnants.
Please see scan to determine for yourself. See Scans to determine how you value this item.
The item "US Scott #s 658 thru 668 Mint Never Hinged MNH Blocks of 4 Set of Stamps" is in sale since Monday, March 25, 2019. This item is in the category "Stamps\United States\1901-40\ Unused". The seller is "scandiman" and is located in Kerrville, Texas. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Sweden, Indonesia, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Bahrain, Croatia, Malaysia, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Brunei darussalam, Ecuador, Egypt, Iceland, Jordan, Sri lanka, Macao, Martinique, Viet nam, Uruguay, Russian federation.