[R-390] The rare bears

[rbethman]

Of all those noted, discovered, and owned, this would be what would be 
considered the rare R-390As, from the rarest on:

[I caveat this by saying - 1) I'm human, therefore make mistakes  2) 
there may be more information that I have either NO knowledge of, OR 
have simply forgotten over the last 10 to 12 years of owning and 
restoring these wonderful radios. ]

1 - The LONE prototype R-390A kept by a Collins team member

2 - The four that were built in 1984 that never saw the inside of the 
ships that they were built for.

3/4 - Those specifically built for specialized use, i.e., R-725s and the 
R-1247 built for NASA.

Pretty much the next critters that would qualify would be, (at least in 
"my" estimation), the first 300 to 400 of the actual Collins manufacture 
from the initial 1951 cost reduction contract.

YMMV!

Just my $0.02

Bob - N0DGN