Looking for image of calendar for Sheaffer intercom desk set

[wags]

Has anyone got an image of an original calendar for the intercom desk set?  I recall seeing some on the web a few years ago, but I'm not finding any now.

 

I think the originals were printed on a cloth-like material.   I just printed this one on copy paper.  But, all I can recall is that they were black with white lettering.  I'd like to work out something a little more accurate.

[joss]

This is a remarkable item, but is it an original Sheaffer combination? I find it odd that the intercom speaker would have been covered with a material that had to be strong enough to be easily removed and yet permeable enough to not dampen the sound of the speaker.

[wags]

I don't have any reason to believe it isn't original.  Also, we are talking telephone sound quality here.  Scintillating highs of 3400 Hz and chest thumping lows of 300 Hz...

 

I have seen images of two others like it online.  If Sheaffer didn't market it directly, then perhaps Ma Bell was working with Sheaffer and selling (or leasing) them?

 

Sadly, the felt on the bottom was nearly gone, along with any identifying labels.  The only label on it is the logo on the front.