Here is a picture of the BC-669 that Jay, KK5IM, has restored into working order. He had to completely redo the cabinet due to extensive damage (cat urine while in storage). He is now restoring the mating gasoline generator hence the need for the plug. 

Thank you all for your help so far. I have a couple of leads on the needed plug.
image.png
73,

Mack
W4AX
https://www.qrz.com/db/w4ax


On Mon, Jun 5, 2023 at 5:09 PM Nick England <navy.radio@gmail.com> wrote:
That "Twist-Tite" is not what we know as a "twist-lock". These were designed to take a standard straight-blade plug and to hold it firmly. We went through a similar search on the Greenkeys list regarding the RA-87 loop supply - Here's some of the conversation -
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Paul Birkel: I have an RA-87 loop supply that I’d like to resurrect but am having difficulty with the DC loop power connectors.  They are Hubbell 9213 l “Twist-Tite” female receptacles as seen in the attached photo.  The diameter across the outer edge of the prongs is exactly 5/8”.  I can’t find any “Twist-Tite” documentatio.
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Me -
I found a 1949 electrical supply catalog with the 9213 "Twist-Tite" receptacle.
https://archive.org/details/MadisonElectricCo/page/n175/mode/2up?q=%22twist+tite%22

The catalog included several other styles of Twist-Tite receptacles (pages 174-175) but NO PLUGS. It says that these take standard parallel blade plugs/caps and provide greater retention. Weird - have you tried a standard parallel-blade plug?
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Paul -

Findings:
1. Both polarized and non-polarized two-blade plugs can be fit into the receptacle, in either direction and equally easily.  I had to search for a while to find a polarized two-blade plug until I realized that my Ryobi drill had one (which surprised me then, and still does now … IMO it should be three-blade/prong).
2. The correct insertion is fully CCW (oriented 215-135 degrees in the photo).  Assuming that the plug has a rectangular body then the long axis aligns with the dog-leg.
3. Twisting the plug CW ~45 degrees results in a satisfying click; the orientation is then 0-180 degrees in the photo.
4.After the click the plug basically can’t be removed with reasonable force, apparently due to a tight friction-grip.  I didn’t try to force it, but the pull that I did try definitely was well beyond what might be caused by a hanging cord, including a trip over said cord.
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Have Fun and let us know if this works!
Nick England K4NYW
www.navy-radio.com


On Mon, Jun 5, 2023 at 4:29 PM Mack McCormick <w4ax.mack@gmail.com> wrote:
>
> Does anyone know where I can purchase the MALE plug for this outlet. The outlet is on a WW 2 generator companion for a BC-669 transceiver. I think the outlet is a Hubbell 9200 though I'm uncertain of that fact. I've searched Google for a couple of hours unsuccessfully.
>
> Part number for the plug or a source would be most appreciated.
>
>
>
> 73,
>
> Mack
> W4AX
> https://www.qrz.com/db/w4ax