Help in identifying this touchtone dial

[zapper]

Hello all,
this item measures 4" wide by 5 3/4" long
Marked 702A 10-72
10 button t.t. dial
The red cap above the #2 would hold a lamp but the holder is broken on the back
Has 4 screw holes in each corner to mount it.
Bell System logo bottom right.
As always, thanks for the replies,
Zapper(Steve)

[Phonesrfun]

It appears to be a key dial drom a switchboard.  Definitely not touchtone, and not for a home or office phone.  I don't know the model of the dial or which switchboard it would have been from.

[G-Man]

Someone on the TCI list posted your photos and ask what it is. Steph Kerman responded with a post that is too lengthly to re-post here that gives a detailed description so it may be worthwhile for you to view it there.

[zapper]

Hi G Man,
My friend Ed posted the request for me and I read the response from Steph. 
Thank you
Zapper(Steve)

[HarrySmith]

A legthy post frpm Steph???

[Greg G.]

Here's the reply:

That keyset was originally designed for some special government defense or FAA
system... I forget now specifically which one, but I think one with a 3xx number
such as 300 or 310. I've seen photos of it in BSPs about that system. I might
have a catalog card.

However they were also used in the Register-Sender Test Panel that was part of
701B PBX and Centrex systems equipped with Register-Senders for the attendants
to use to complete incoming calls. This includes 701B PBXs and Centrex
installations with cordless consoles and 701B Centrexes equipped with 608 cord
switchboards because these 608s did not have a station jack multiple for
completing incoming calls since most calls were completed by DID.

So when the attendant was recalled on an incoming call she transferred the call
by dialing the extension number into the incoming SXS switch train instead of
plugging directly into a station jack as on a 701B PBX equipped with cord
attendant positions. They installed somewhat "cheesy" plastic button #21-type
dials on the cordless consoles and #23-type dials on the 608 positions, both
having a rather poor feel but installed one of these elegantly made keysets with
a great "feel" on the R-S test panel in the equipment room to be used only once
in a great while if ever. Someone at BTL was not thinking clearly that day.
;-)

Steph