Looks like the same one used on my 50s-era RBK-16. Will need to dig it out to check. Pretty sure I've seen it used on other Navy sets too. ~ Todd, KA1KAQ/4 On Wed, May 16, 2012 at 7:26 PM, Nick England <navy.radio at gmail.com> wrote: > http://www.navy-radio.com/rcvrs/switch/patch-49121A.JPG > >