These devices were made for the most part to attach to candlestick telephones although there were exceptions. Both will be shown on this webpage.
Scroll down to see all the pictures.

This framed card was sold in drugstores, etc., to those who wanted to protect their
painted fingernails when dialing a telephone.  The metallic circles “punch out” of the
card and “snap” into the finger holes of a Western Electric dial (they may fit others
too).  It’s interesting that the dial ring appears to be the Daisy wheel variety found on
Western Electric three slot payphones.  This has been framed to permit the viewer to “see
through” the holes.
This is a very rare pencil holder made for a deskstand.  Only a couple of these given
away by an old time Colorado Coal Company survive today.  I have a number of these
advertising pieces in my collection.
This is very rare diallock made for Western Electric #2 dials.  It will not work on any
other model of dial.  It is a cast bronze piece that fits around the #2 dial fingerstop
which is mounted to the outside rim of the dial housing.  This may be the only one of
these locks in existence.  Telephone calls in the 1920’s were very expensive and those
with phones often had to lock the dials to prevent unauthorized use.
A very large green mouthpiece manufactured in Los Angeles during the 1920’s.

Only five of these mouthpieces are known to exist and they were found several years ago
by one collector.  One of the mouthpieces that was found did not have the central
mounting piece so the owner, Ray Kotke, fabricated a suitable replacement.
Mounted on this tapered shaft candlestick is a special locking device, which
was designed to prevent unauthorized use of the phone.  When the padlock
was in place, the phone could not be used in any way.  There were two types of
locking devices, the one pictured and another to fit regular straight shaft
telephones.  This phone is a Stromberg Carlson tapered shaft stick, which can
be seen elsewhere on this website.
This is a very special attachment known as a MutaPhone. It attaches to the normal mouthpiece on a candlestick phone by a wire harness held in place by two springs. A part of the MutaPhone protrudes into the mouthpiece. This device, like the Hush-a-Phone, provided a more private conversation for the person making the call. The mouth was held against the cup-shaped device on the left end.
This is an advertising disc that fits on the front of a candlestick faceplate and is held in place by the threaded mouthpiece.  They are very difficult to find as they were distributed, free of charge no doubt, in the twenties and thirties, perhaps even earlier.  They are generally made of celluloid which has a thin cardboard backing for strength.  I have four different types and all are originals in mint condition.  In this case, the faceplate is held in place by a colored “bakelite-like” mouthpiece no doubt made about the same time.  One telephone manufacturer was known to have made these mouthpieces in the same 10 colors in which they offered telephones.
The advertising piece attached to the transmitter mouthpiece of my wall switchboard is my latest acquisition. The piece is made of celluloid and “snaps on” the rim of the standard mouthpiece. I find it interesting that undertakers often combined this service with a variety of other businesses as undertaking may not have been very lucrative in those days. Mr. Miller’s business was located in Clarkson, Nebraska. Note his phone numbers and the fact that they were most likely on the same party line. I suspect that casket making was one of the furniture products?
This is a very special mouthpiece cover called a Telephonia, a trademark name. It was first patented in September, 1902. It attaches behind the mouthpiece and covers the front of the mouthpiece with a hinged cover that contains an absorbent material that is soaked with disinfectant. The purpose of course was to keep the mp germ-free. The hinge on the cap cover can be seen just to the right of the engraved Telephonia name. This is a rare piece indeed.
This is a very rare attachment designed to amplify the voice of the person speaking into the phone as well as prevent those around the user from hearing the conversation. This is known as a MuflaPhone attachment. It is somewhat relatedto the MutaPhone and the Hush-a-Phone items, and I have not seen another like it.
This is a very rare attachment for a candlestick or deskstand phone which provides a way for the phone user to keep track of the minutes and seconds for each phone call. The special forms above the clock face were used to record the calls and their duration. The unit has a start-stop lever as well as reset lever that also winds the clock when it is reset. I have only seen one other of these special clock devices.