I don't think so because I found that number in a business where I had access to their phone room. They were served by a Panasonic KX-TD1232 with a TVS200 and had 6 C.O trunks with hunt capabilities. It was listed next to their 66 block. I can't take photos though if you need some proof because it involves sensitive materials.
EDIT: I managed to snag a photo. 18 May 2014 at 00:49 CDT.
Please keep in mind that their PBX system was installed in late 1993... about 6 years before mandatory 10 digit dialing.
Edited by ramsaso, 18 May 2014 - 12:58 AM.