Collins definitely made the receivers. Hallicrafters had two contracts to supply them along with the CY-1260/G cabinets. This cabinet worked with R-388’s that had little roller wheels at the rear corners. Hallicrafters made the cabinets. I don’t know whether the roller wheels were added by Collins or Hallicrafters. 
Photos and contract numbers are at
https://www.navy-radio.com/rcvrs/r388.htm

Additions and corrections welcomed. 
Nick K4NYW 

On Mon, Oct 9, 2023 at 11:56 AM Dave Merrill <r390a.urr@gmail.com> wrote:
I have an "INSTRUCTION BOOK FOR RADIO RECEIVER R-388/URR" dated 5 September 1951 which states "Manufactured by The Hallicrafters Company Chicago, Illinois Order Number 3357-Phila-52"

This looks just like the Collins version of the manual, enameled paper, same typeface, manila covers, etc.

So do you suppose this was one of those deals where a second source was required and Collins either shipped complete or incomplete units at wholesale to Hallicrafters for final assembly and delivery? I'm sure Hallicrafters was more than capable to make them from scratch but setting up the tooling, procurement, assembly line, quality control plus everything else would have been expensive.

Apparently they exist because one is on Etsy.

Dave N9ZC 

On Sun, Oct 8, 2023, 4:24 PM Nick England <navy.radio@gmail.com> wrote:
Reading a congressional hearing on sole source procurement (yet another internet time sink), I came across this summary of Collins contracts for the US Navy. Shows quantities for some of our old friends like URC-32, R-388, ARR-41, ARC-38, PRC-47, TRC-75, and KWM-2
(and what are 522-1298-00 transceivers?)

Nick England K4NYW
www.navy-radio.com
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