1930s Vintage GPO style Two Pole DPDT Large Knife Switch – Mullard Antiques and Collectibles
Amazon.com: American Educational 7-KS-1 Brass Small Knife Switch, Single Pole Single Throw (SPST), Plastic Base, 2" Length, 1" Width, 1" Height (Bundle of 10) : Industrial & Scientific
5 Way ST Knife Switch Old / Antique Works Fine Screws Included | Reverb