"Last Day Of Sale" Covers?

I'm going through a FDC accumulation and it includes some "Last Day of Sale" cancelled covers. From what I can determine, this was a relatively short-lived experiment by the USPS in 1997.

Do any of these covers have any value or are they pretty much the same as FDCs, i.e., no value?

One of the more interesting ones is a cover of Scott #3019-3023, the antique autombiles, with a strip of 5 canceled first day of issue on 11/3/95 and a second strip of 5 canceled last day of sale on 3/16/97, both on the same cover.

Others include the Pacific '97 50c and 60c souvenir sheets (Scott 3139 and 3140) matching FDoI and LDoS covers.

Thanks.

Well, like FDC's it would depend on the stamp. It would not be correct to say that all FDC's are of "no value." Actually, all have some value, though the value is not much is most cases. It would be better to say that they are probably not worth any more than an FDC of the stamp in question. In my collection of airmail FDC's, I have only one or two "last day of rate" covers. They are not that common. I think I may have (or have seen) a Mae Weigand last day of rate cover for one of the Transports. Now that is worth something! But so are all of her covers.

Afterthought: it just now dawned on me that you may be implying that these have a special "Last Day of Sale" cancellation. Is that true? That, then, is different than the "Last Day of Rate" covers I have seen; these would have ordinary postmarks for the last day the rate was effective. If these have a special cancellation, then I might think they have some extra, though limited, value. The thing that probably limits the value is that they are of more recent vintage. But to FDC collectors of such, they might have some additional value as exhibit items. Again, the value will be limited by the recent vintage. But it might not be negligible. Modern FDC's with unusual "UO" (unofficial) cancellations can often bring a nice premium. If you are not interested in them yourself, just put them up for sale on ebay, and if aptly described, they will sell for what they are worth. If they do not have cachets, market them like Mccusker does, as "suitable for add on cachets."

I've never run across anything to indicate that these are worth much, I've kept mine just to enjoy this curiosity. I have: United Nations, Marilyn Monroe (USPS issued it both as a last day cancel only and with a first day / last day joint cancel; I think I also have the full sheet of Comics on a last day cover.

Also, "Lsst Day of Sale" likely only refers to the last day the Post Office's philatellic division or perhaps main distribution center stopped selling them. A large number of post offices, especially the smaller ones, often had stocks of stamps in their drawers and safes that they continued to sell until they had no more which sometimes could be long after they were delivered to them by the distribution center. As such I am not sure there really is a date that one can say was the last day that the Post Office stopped selling a given stamp.