[WTSHNN]

A lot of Postal Trucks survived as they were kept in service by the USPS up into the 50's and 60's so they were kept in good shape (for the most part) as opposed to a lot of the other bodystyles that were left out to rot in pastures or beat up in private ownership.

Standrives are fairly rare but there are still a dozen or so out there.

It is when you get into the AA's that you start to see very low numbers of survivors since some of those vehicles only had 50 or 60 examples produced.