Aircraft Radio Corp pieces with the "circle-M"
marking and no serial number are unique sets-
"rarer than rare."  First off the production line,
marked and stored in the company "Morge."
There is only one of each type item in
the universe so marked. 

The "circle-M" T-19 transmitter is being offered
on Ebay.  Someone I cannot understand painted-over
the "circle-M" marking next to the antenna post,
but other markings and no serial number peg
this the "the" T-19 example.

I'm dealing with some issues right now and
can't be spending money on such, but someone
out there with some mad money who values
our sets and will be a good steward can get 
it before someone cuts it up for a VFO or
stacks it in a basement for the grandkids
to discard.
If I could, believe me I'd soon be using q-tips
and gently finding a way to uncover that "M", lol.

Not mine and I do not know the person offering.
https://www.ebay.com/itm/167674439207

TNX OM ES GL DE Dave AB5S