Manufactured to military specifications by Grayhill Highland in the UK, as part of their 44 series of stacked rotary switches, these are a premium quality rotary switch with 3 contact sections each been 1 pole 3 way, making a total switch configuration then of 3 pole 3 way break before make.
60 degrees between positions,
Rated upto 1A at 125V mains
Overall dimensions of the main body are approximately 43mm deep 30mm diameter, with a 6mm round shaft which protrudes from the switch by 25mm, mounting is a single 12mm hole.
Connections are solder tags.
Full datasheet is at: http://www.grayhill.com/assets/1/7/Rotary_42,43,44,54.pdf Under series 44.
Priced and supplied individually, each (x1) - A fraction of the real cost for a switch of this spec.