As we are going into the spirit of the Christmas season, I thought to spoof “Ugly Christmas Sweaters” to do a similar thing to operator consoles.
Today’s will be 
This is a Mitel operator console. Before they were seriously electronic, the set was bulky, I believe metallic or heavy duty and the Busy Lamp Field would literally mean a field of lamps with no button access.
They stopped making this around the late 1980s, but wouldn’t be surprised to see these installed in SX 50, SX 200 or SX 200 Superswitches.
PICTURE IS NOT MY OWN. It was snatched by an eBay listing