Magnatone manufactured the Model 12-D Remote Speaker between 1957 and '59. They matched the Model 213 and Model 213A. They were used to expand the vibrato sound and came with a 20-foot cord that plugged into the "Remote Speaker" jack on these amps. The above Model 12-D has an Oxford 12" speaker stamped 12K5R-1 (date code: 465-947 on frame and 4606 on the magnet).
Original List Price: $79.50
Serial Number: Not available
Owner: Alex Volpe, Not for Sale
Photo: ©1997 Alex Volpe. Used by permission.

This is another example of the Model 12-D Remote Speaker. It has an Oxford 12" speaker stamped 12K5R-1 (date code: 465-947 on frame and 4606 on the magnet).
Serial Number: Not available
Owner: Alex Volpe, Not For Sale
Photo: ©1997 Alex Volpe. Used by permission.