Those have a Schermack Type 2 perforation on them. Large mailers used Schermack's stamp affixing equipment, which often was less than accurate in separating the stamps.
Catalog values have little relationship to actual market value. Once you have a catalog number for the stamps, you can use the eBay search feature and filter only on 'sold' listings. Then you can factor in condition.
Don
Would it be wise to get a certificate for these stamps, Thank you
