[Milsurplus] Re: [The WS No.19 Group] CW Key J-5-A

[Donald Sanders]

Over weekend I found a Key at flea market. It is round body, 
square 2.5 inch  base, with left side arm for keying, 
marked US Army SC Flame Proof Key J-5-A, bottom has 
orange stamp SC253A. Order No. 267C NY 41.
Any one have an idea what equipment this was used on?
Healthfully yours,
                          Don W4BWS
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