Kaywoodie began as a line of pipes offered by KB&B (Kaufman Brothers & Bondy) in 1919. Ultimately, KB&B changed its name to "Kaywoodie". It became a brand of S. M. Frank & Co from March 1955.

The cloverleaf logo: the round logo (black cloverleaf in white circle or white cloverleaf in black circle) was first used in 1937. Up until the late 40's this logo was used on all of the upper grades pipes. The concomitant use of the plain white cloverleaf and the disk inlaid logo continued untill the early 80's.
Up until the late 1940's/early 50's, the logo was on top of the stem. After that the logo was moved to the side of the stem (exceptions exist).

The code: see comments about "President" pipe

Kaywoodie seconds: Bentley US, Devonshire

▲ KB&B inside clover stamped on the shank.

The white logo has the shape of the Drinkless systeme (see dok) which equipped these pipes from 1924. This Shellcraft has a push tenon and was thus crafted prior to 1930.
No KB&B clover stamped on the shank.
See also: the Shellcraft as a Kaywoodie line and the recent Kaywoodie Shellcraft Made in Italy.

05 should be the shape code (short shank billiard), and the 27 (1927) may be the production year. Push tenon design (pre-synchrostem) .

▲ Rock Ambera: Bakelite stem with appearance of amber. These pipes had a black cloverleaf.
Period: 1929 - 1931
More about the PAT. APP. FOR stamping.

▲ "KBB" inside clover stamped on the shank was canceled in 1933.
The lack of "PAT. APP. FOR" stamping would indicate the synchrostem patent was allready granted (1932) when this pipe was crafted.
Thus this pipe may be dated rather precisely.

The clover stamp with the KBB initials on the shank indicates a pipe crafted in the old KB&B plant at Union City (NJ) prior to 1933.

The first Super Grains appeared in late 1931 or early 1932. They are the only pipes Kaywoodie produced with the shamrock inlaid in the shank and not on the stem.
The PAT. APP. FOR stamping being canceled in 1932, this pipe is one of the very first Super Grains produced.
Shank embedded logos were stoped by 1938.

Differentiate an early Super Grain from a post WWII Super Grain.
More about the PAT. APP. FOR stamping

▲ This pipe shape - called "President" - is a Kaywoodie's distinctive production. It has never been copied.

The PAT. APP. FOR stamping allows this pipe dating: 1929-1931

Until late 1930's pipes were stamped with a 4 digit code (this pipe: 7793).

• The first 2 numbers (77) designate the style or finish.
• The last 2 are the shape numbers (93).
• The numerical code may be reinforced by a letter for variants.

Thus the small "President" pipes are stamped 93S while the larger bear a 93L (see also this Super Grain pipe).

Later Kaywoodie will cancel the 2 first style/finish numbers keeping the 2 last shape numbers and the letter for variants (i.e. Allbriar or Connoisseur).

Period: 1928-late 1950's
"Made in England" Suntans have been produced more recently.

▲ KBB inside clover stamped on the shank (prior to 1933).
Period: 1928-late 1950's