Sage Laboratories. Model SAM 490 E. SMA connectors. DC to 12 GHz. SP4T rotary switch. VSWR from DC-8 GHz is about 1.3, from 8 to 12 GHz is about 1.5.  Insertion loss is about 0.3 dB from DC to 5 GHz and 0.5 dB from 5 to 12 GHz. Isolation average is 70 dB. Power handling is 3.0 KW from DC to 0.1 GHz, 1.0 KW from DC to 1 Ghz and 300 Watts from DC to 10 GHz.  RF Voltage rating is 1500V. Switch has rotary solenoid actuation with latching. Self de-energizing. Operating voltage is 24-32 VDC with 28 VDC nominal.  Switching time is about 50 mSec with about 30 switches per minute.  Connectors spaced 90 degrees apart for output with top input. Pin out is A (common) and B, C, D and E (ports). A is common and is -VDC connection. In 1984 these cost $480 each. Finish and cosmetics will vary a bit from switch to switch. Enjoy!