First, are these more or less common than the ones with logos on the envelopes. Second, if I were to classify this with a Scott number, would I use the first day cover Scott number or the stamp Scott number? Thanks, Steve
These are all common, addressed FDCs. The fact that they do not have a cachet (the proper term for your "logo" reference) make them less collectible. Even if they had cachets, they would be less collectible because they are all addressed. Most FDC collectors want covers with cachets and unaddressed.
There is no separate Scott number for FDCs, so you don't have to worry about that. They are all listed under the stamp in the Scott Specialized Catalog. Except for the early, more valuable ones, the listed Scott value would be for cacheted FDCs which are unaddressed.
As John mentions, these are minimally collectible and most collectors of FDCs, outside of the very early ones, want cacheted and never addressed examples. And most collect according to the cachet that was applied as typically there were many companies and individuals making different cachets for each first day of issue. Some are more colorful and more artfully done than others, some were made in large quantities and some in small quantities. All of this factors into collectability, though for the most part "modern" FDCs, and these would be included in that definition, even with cachets and being unaddressed have rather minimal values, typically much less than Scott Specialized values. The good thing about this is that a collector can buy large numbers of them for minimal cost and assemble a very nice collection.
To confuse the point: Often FDC collectors utilize a dual numbering system for cover identification. First, the Scott's number, #903 for example = Vermont Statehood. This is followed by a second number, P (Planty) or M (Mellone) number, 36 for example = Dorothy Knapp HDHP FDC. So #903-36 refers to only one FDC cachet, the Vermont Statehood FDC with Dorothy Knapp cachet. Of course, one needs to have the two catalogs to communicate. In addition, on occasion, additional letters or numbers are used for cachet variations or color differences. Point confused? Respectfully submitted: jrc