The "cachets" (pictures/prints/artwork on the left of the cover) are privately created by many cachetmakers for every new stamp issue that comes on the market. The US Post Office only affixed the stamp and the "First Day of Issue" cancellation.
As to the examples you have scanned, the first two (Netherlands and Norway) are House of Farnum cachets; the last one with a photo making up part of the design is a Crosby Thermographed Cachet.
All are collectible but not necessarily valuable as they were all produced in quantities of about 150,000 to 200,000. Scott catalog value is around $4; on the secondary market, the value is probably 20% to 30% of that figure. The one with the plate block of 4 is worth a bit more; the one that is unaddressed is also more desirable to collectors.
I don't think it really matters, as long as you identify the cachetmaker. There are some collectors who strive to acquire as many different cachets for a single issue (and there are dozens!) and others who may collect only covers with one specific cachetmaker's artwork.
I haven't run across too many people that particularly care about the time stamp on the postmark. As long as they are correctly postmarked the First Day of Issue, the time is not all that relevant.
Thank you very much, wt....I understand about the time stamp...I thought there might be a direct correlation between exact time stamp within the set...where, in another issue, the time stamp may be different.
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