Series 5 or Series 6 Circular Plastic Connector. The body number is on the back or around the radius. Its not odd, they are very common in laser systems, defense, medical, and heavy industry. I'll wager the design is older then you are.
Used to be Amphenol, then the line was bought by Tyco.
Digikey and Mouser are your friend. The big blade pins only go into the connector once, so be careful. The smaller pins are removable with a 29$ tool.
You need to determine the Sex, Size, Body Number, and Type/Size/Sex of Pins you need to order. There is normal and reverse sex in the factory terminology for the body, but the pin arrangement is the same, you have to watch that.
Careful study of the on-line data sheets will get you the information you want.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...