Number card

[Pourme]

This is a odd number card on a D-1 on EBAY....

[Jim Stettler]

Given the advertising. I think it may be an "authorized" attachment.It replaces the number card holder with police, fire and phone # , as well as  easy to read #'s.
Just a Guess,
Jim S.

[unbeldi]

The yellow is just a sticker someone placed on the metal.  My first guess is that this is actually not a replacement for the original number card group, but a snap-on cover.

[Jim Stettler]

It seems to be more "civic" oriented vs advertising.
JMO,
JimS.

[TelePlay]

How about the Hall-Chadwell people who provide ambulance service in El Dorado, Arkansas?

See the ambulance and funeral home ad in the left column near the bottom, September 22, 1944.

http://arc.stparchive.com/Archive/ARC/ARC09221944p03.php

What's the seller's location in the eBay listing?

[Pourme]

I like the snap on center piece (never seen one before) as well as the sticker.....gives this phone 'personality'.....