Ericofon - Aqua Mist - Touch Tone Upgrade Antique Phones In the early 1960s the

In the early 1960s the design was adapted to the new "touch-tone" technology with the introduction of the 2500 deskphone and the 2554 wallphone

while still meeting their audio quality expectations

This is the same process the phone companies used to refurbish their own telephones

Interestingly

Ericofon - Aqua Mist - Touch Tone Upgrade Antique Phones In the early 1960s theHere is a pristine Ericofon. This phone is "Aqua Mist" (bluish green) in color. History The Ericofon was designed in the late 1940s by a design team including Gsta Thames, Ralph Lysell, and Hugo Blomberg. The two major components of the telephone, the handset and the dial, are combined in a single unit. This one piece design anticipated the evolution of the typical cordless phone and cell phone by several decades. Serial production began in 1954.