Top quality Non Genuine Lucas type SPB104 PS7 Dash Push Pull Switch with British Made Ivory/Cream Knob
As fitted to many of the classic British cars of the 1940-60s
The treaded part is approx 10mm between the 2 nuts if you remove the spring washer or 7mm without  
Austin, Austin Healey Jaguar MG Morris, Sunbeam, Triumph etc
Reference numbers include:
31179, 31199, 31389, 31410, 31419, 31431, 31434, 31474, 31498. 31515, 31557, 31869 & 2H4841

34316, 34623, 35659, 312955 54033230 & Jaguar DAC3847

Thanks for looking!