The Commodore 1084S monitor is commonly used for C64 and Amiga computers delivering nice RGB colors and stereo sound. I had this monitor on my Amiga 2000 and C64.
This particular iconic model I had in the beginning with my C64 and Amiga simultaneous connected, being able to switch between the machines.
In the manual was the original invoice stating it costed Fl 699.00 in 1991. I checked on inflatiecalculator.nl and it shows 699 Dutch guilders in 1991 is now (2019) approx E 564 (USD 627)
I’m currently using this monitor with my Amiga 2000.