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I invite you to click on the small picture to see a larger version.
These photographs are not to scale

 All Western Electric telephones displayed from this page on retain original finish, cords and felt/leather base covers.

Western Electric #20S Desk Stand
Western Electric #20S Desk Stand Close-up of Flint Glass Mouthpiece Marked OST

c. 1907-1912 - Note: Equipped with flint glass mouthpiece.

Pair of Western Electric #20T Desk Stands
Earlier model with solid perch
Later Model with drawn perch

c. early model: pre-1912; later model: post-1912
Larger View of Internal Patent Dates

NOTE: Early 1st style 143 receiver which replaced the earlier 122 OST receiver. The patent dates are stamped internally. After production of a few subsequent 143 styles, the 143 was eventually replaced with the 144 receiver.

Western Electric #20AS Desk Stand
#20AS Desk Stand Closeup of Composite Dated mouthpiece

c. 1912-1915 - 4-Button Intercom with 528 diaphragm type receiver. Note: Equipped with a dated Western electric brass threaded mouthpiece made of early composite. Has " PAT.D FEB.28-1911 - APRIL.4-1911" in raised lettering under the outer edge of rim. (Compare to mouthpiece on 44BG model desk stand pg.3).

#20PC Desk Stand
#20PC Desk Stand Interior of 143 Receiver First Style 143 Receiver 1st Style 143 Receiver fully marked and dated

c. 1912-1916 - Dropped switchhook, equipped with 2nd style 143 receiver having no markings on top with fully marked & dated 143 cap. Note hanging telephone directory; one piece number card holder.

#20AL Desk Stand

c. 1912-1916 - The 20AL is the most common of the WE manual stick phones. This one is much more interesting due to some unusual attributes. It is equipped with a Type 1 Wonderphone transmitter with a quite rare Hubbell sanitary mouthpiece attachment having the original gauze insert. Wonderphone produced lugs to fit perches from various telephone manufacturers. It has a 3rd style 143 style receiver with early dates and marked 508. The 508 receiver was used on railway dispatching telephones with a resistance of 550 ohms.

Note: Base mounted number card holder.

#20AL Railroad Application
#20AL Railroad Application #516 Watchcase Receiver

c. 1912-1916 - High slung switchhook; #516 Watchcase receiver.

#40AL Desk Stand
#40AL Desk Stand 3rd Style 143 Receiver

c. 1915-1939 - Constructed of steel rather than brass, with perfect Bower Barff finish; Equipped with 4th style 143 receiver having later dates (1900, 1901, 1913) at top. Note number card holder with Bower Barff finish matching phone.

Close-up of 143 receivers
Here is a picture of 5 different types of 143 receivers with misc. marked caps. These are just what I am aware of. If anyone can show additional styles, I would enjoy hearing from you.