Stamps (Philately)/Rare? US FDC

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Question
On going through my rather large collection of US FDC I noted that one of my FDCs Commemorating the Mackinac Bridge June 25th, 1958 was covered with autographs and for the hecl of it I Googled the first one: Prentiss M Brown.
It turns out that my envelope has been autographed by:
Prentiss M Brown - The father of Mackinac Bridge
David B. Steinman - the constructor of the bridge
William J. Cochran - member of the first board
George A Osborn - member of the first board
Murray Dan Wagoner - member of the first board and
Arthur E. Summerfield - Postmaster General of the US
I have been working overtime on Google and have not seen any like it at all. How rare is it ? and do you have an educated guess of its value??
If needed I can send you picture.
Kind regards
Ole Jensen
Tune, Denmark

Answer
First Day covers with related autographs are a fun way to collect them, and depending on the scarcity of the signatures, they can add significant value to the cover. Most "Event"-type FDCs or as in this case a famous structure, are generally not worth a whole lot simply because, in general, few collectors care much about a bridge and even less care about the associated related signatures. But I would guesstimate your cover has a market value in the range of $50/100.00.  Which isn't bad at all!  Hope this helps?

Bill

Stamps (Philately)

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William R. Weiss, Jr.

Expertise

United States - Virtually any kind of stamp, cover, essay, proof, cancel, covers, etc.

Experience

I have my own expertizing service - Weiss Expertizing. See here; www.stampexpertizing.com.

Organizations
APS (Life member), USSS, UPSS, USPCS, USCC, EFO Club

Publications
Many different.

Education/Credentials
High School

Awards and Honors
Too numerous to list here - I have been exhibiting for over 40 years, so have accumulated lots of awards. Also for books I have written.

Past/Present Clients
Thousands different. We ran Public Auctions for 25+ years and I have been a dealer since 1972.

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