Genuine or fake, I'd offer $50 shipped.
A 1934D $5 Silver Certificate of the U-A block uncirculated lists at $40-$60 depending on wide or narrow variety.
The plate check numbers on the back help to determine the variety.
A total of 491,666,000 notes of all varieties were printed.
If fake, it would be a great conversation piece.
It is possible that the missing serial numbers were "bleached" or altered to create a rarity....
I wouldn't know if it was fake or not until I had it in hand, for closer observation.
If I felt that it was genuine, I'd certainly send it in for certification.
Keep us updated!
Scott