Monogram plaque on 1958 flying cloud

[bevman]

The serial number, on the plaque by the door is the correct serial number and should match the VIN number on your "pink slip" DMV documents. Any numbers "on the roof"... red or otherwise, are club membership numbers. They seldom match since the club numbers are issued to the member, not the rig. If you get a new trailer, you take your club numbers to that new trailer.

[66Overlander]

Originally Posted by johncurtis

Besides the roof and the area below the side window, are there any other places to find the serial number? Is it the same number as on the title? Thanks!!!

Bevman is correct. The serial number is on the plaque near the door. For a late 1958 22' Flying cloud,a number formatted as 22-85xx is correct:
58FC

Thus your 22-8515 appears to be the correct serial number.

Later Airstreams also had/have the serial number stamped into the frame on the tongue, but I do not know if that practice was in place in 1958.

The "Big Red Numbers" (or ghost outlines of them) above the front and rear windows are membership numbers assigned by the Wally Byam Caravan Club International (WBCCI) that have no relation to the trailer serial number. The ghost outlines are often left after the numbers are removed if the trailer is not polished heavily because the numbers protect the area of aluminum skin under them from wear and oxidation. That difference is often obvious if the numbers were left on the trailer for any extended period of time before removal. It is the WBCCI membership numbers that I can use to identify possible prior owners. The club never kept records of the serial numbers of Airstream owned by club members.