Vintage AT&T ITT Cortelco 2500 Orange Telephone Touch Tone For Sale

Amazing orange color.
Vintage AT&T ITT Cortelco 2500 Orange Telephone Touch Tone - There's a stick on it that makes it look like it might have been refurbished by a company called Beco in 2002, but not sure. Pristine condition. There is a plastic piece that looks like it covers the rear opening under the handset holder that appears to have come loose inside, but I wasn't able to take it apart to see if this just needs to be placed back in position. See pictures.