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Dual cancels on FDCs are quite common.
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While your covers may be FDOI, my example has a FDOI stamp on it. FDC with FDOI stamp on them is different from a stamp obtained on the first day and hand stamped on that day.
Look again at the
Columbus cover I posted above. On the sheet, there is the FDOI
slogan cancel which reads "First Day Of Issue" with that being the
slogan. Likewise the Official non-FDOI Slogan Cancel devices are also made available during the grace period window for requesting
office official FDOI cancellations. ANY properly dated cancellation which shows the date the stamp was issued is a FDOI Cancellation, official or not. Now look again at the sheet and besides the one Official FDOI Slogan Cancel, there are three round date cancels which are of the Official non-Slogan Cancel device. There are several to many individual official cancellation devices to meet the expected demand for official FDOI cancel, slogan and non-slogan. The sheet also shows a pictorial slogan cancel on the $5 Columbus which includes the words (slogan) "FIRST DAY OF ISSUE."
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But yours is unusual in that there is only one stamp. To get an additional cancel, there should be an additional stamp.
This statement is true for the additional stamp when one is requesting a cancellation at a different geographic location from the FDOI location. Your card was cancelled both times at the same location, by request, of the servicer. Heck the servicer could have been the person to apply both cancels, not one of the postal employees there to do the same, especially on complex FDOI Covers. I posted a complex example below.
I created and own, but it is buried from photographing, a FDOI cover in 2003 in Columbus, OH at the APS Summer Show. I, made some purchases which I did not wish to carry with me so I wrapped them up and sent them home on the Mary Cassett FDOI getting the Official FDOI Slogan, Official non-slogan AND an
unofficial Columbus cancellation with the FDOI date. The third cancellation device was needed as the item I was sending was sent Registered Mail. This was still during the time such extra services were still available at show US post office tables unlike today.
Note: As you indicate that you are not versed in FDCs, I will point out that the Scott US Specialized Catalog in the first day listings, both tabular and individual, will indicate the, or the various, official FDOI locations. The exception is the stamp whose FDOI was any post office in the country that was open for business that day such as Mothers of America and The United States Postal Service Stamp. The slogan, "First Day of Issue" first appeared the same year the Mother's day stamp was issued, 1937.


Hideaki Nakano was the creator of the most complex FDOI covers you can find. The above is "simple" compared to others. Here only two of the four sides are shown but with close examination you can discern at least one of the two in-folded sides.
The collectors or creators of FDCs are one of the three largest groups, APS, ATA (American Topical Association) and AFDCS (American First Day Cover Society) in the USA.
As to the $$ question, your card would sit in a dollar box until I came along but I would still try to negotiate the price as it belongs in a quarter box. As a FDC, what goes against it is it is postal stationary, a post card as well, no cachet, cluttering extra superfluous postmark. And yes I would like it for that extra postmark.
Edited for word correction (thanks auto-spell).