Looking For Help With Stamp Booklet Scott 91*

I have been researching my stamp booklet Scott-91 for authenticity. I used the Scott "Specialized Catalogue of United States Stamps & Covers", Booklets: Panes & Covers.
Another source is the 1999 "United States Stamp Booklets" by Robert Furman.

The information in the Scott Catalogue is straight forward and all Panes and Outside Front Cover (OFC) are the same as shown in the Book by Robert Furman. The problem arises with the Outside Back Cover (OBC) which to my believe is not shown anywhere in the Scott Catalogue. Using Robert Furman's book, my research has shown the Outside Back Cover (OBC) to be as shown in picture one (1) below.
The Outside Back Cover of my Booklet is shown in picture two (2). So far, I have not been able to find a resource to verify that the Outside Back Cover depicted in picture two (2) is authentic.
That brings me to two possible alternate situations.
One, I have not found an additional source which may show the Outside Back Cover of my booklet, or
Two, the booklet has been tampered with by assembling it with individual covers and panes, however using the incorrect Back Cover.
I hope all this makes sense, It's the best way that I can explain my questions.
I would very much appreciate help from anybody with knowledge about this specific subject.

hawkstamp

Can you post an image(s) of your booklet?
Don

Hi Don and all
Here are the four picture of my booklet 91

Pete

Here are value hints if good: https://siegelauctions.com/lots.php...1&page_no=23 see lot 1316. And the results of a power search: https://siegelauctions.com/lot_grd....emailflag=on

I believe the cover version without line nine is a later version. On March 1, 1941 the interest earned after that date becomes taxable per a ruling printed April 21, 1941. Thus the prior statement that no principal ("cost") nor interest will be lost is no longer true. See Chapter XVIII (as placed in the July 1945 issue)or equivalent of the USPOD Postal Guides of the era. Additionally interest was lower in two states, Mississippi and New Jersey at 1% with all other locations at 2%.

Not all combinations of covers have been necessarily recorded, so the use of the back cover on your example does not scream "fraud" rather not documented. If you look at my friend, now deceased, Phil's booklet sale, even Siegel's admitted seeing items new to them even with a large run of the booklets made.

To my eye the back cover staples look unaltered, however, you did not show the staples area on the front cover. Perhaps you will as the front and back images work in concert.

Mountainside Stamps in New Jersey (call them) has long carried booklets and may be able to provide you with back cover records for BK 91 from their files.

Full disclosure, my booklet interest and experience is generally limited to just the booklets with the covers of either the 2 cent (non-97 cent booklets) or 10 cent (97 cent booklets only) Parcel Post Stamp vignettes. The backs varied.

There were errors in the first edition of Furman (I don't know if this was one of them ) and some of those errors were corrected in the 2nd (final) edition (although the images in the 2nd edition are really poor). Since then I think the United States Stamp Society has published something on booklet covers, but I do not know if it simply lists the different types, or if it also lists which types are associated with the dfferent BK #s.

Albert's Stamps of Brooklyn, NY also has a long history of dealing in booklets.

Thank everyone for your help and tips. I will continue to research including the venues you have provided.
Thanks again.