(*) This stamping was left off in Oktober 1918. From this time onward the pipes were marked "DUNHILL" over "LONDON".
The two little circles are some indication on work/pricing/quality. Their precise meaning is not known.

• Value (Estate): 376.00 GB £ • 475,40 €

The patent number 5681/12 doesn't exist. The patent number associated with the Innertube is 5861/12 and it seems the marking of this pipe is an error.
Value (Estate): 510.75 US$ • 330,20 €

From 1921 trough 1931 (inclusive) Shells were stamped DUNHILL'S "SHELL" if there was a MADE IN ENGLAND line. When MADE IN ENGLAND was missing they were stamped DUNHILL'S "SHELL BRIAR": this pipe hasn't any MADE IN ENGLAND line.
• Value (Estate): 305.00 US$ • 201,60 €

* This pipe has no year suffix
Bruyeres with tails on the D were produced from November 1920.
• Value (Estate): 376.00 US $ • 243,40 €

This pipe has no year suffix
Bruyeres with tails on the D were produced from November 1920.
• Value (Estate): 300.00 US $ • 204,20 €

The wood of this pipe is coated with 10 karat gold tested by the owner of the pipe (black stone test).
The "N^os" (with an "s") stamping coming after "PATENT" indicates a pipe with a double patent. The first patent number (5861/12) is legible and corresponds to the English Innertube patent. The second is worn out by the gold layer but can only be 119708/17. This patent pattern (5861/12 119708/17) was used in the 1918-1926 period on sandblasted Dunhill pipes.
The patent number PAT.N° 141486/19 on the box (granted in 1920) is compatible with the pipe stampings.
It corresponds to a ventilated box design (see Vercingetorix pipe).
For these reasons the manufacture of this pipe may be situated in the 1920-1926 period of time. A more accurate dating would be risky as to the lack of a year suffix. The gold plated Dunhill pipes were fist mentioned in their 1923 sales brochure.
• Value (Estate): 1,221.00 US $ • 853.00 €

This pipe is stamped twice "Made in England".
See also other HWo (Hand Worked) pipe: BRUYERE without patent 1925
• Value (Estate): 326.00 US $ • 205,60 €

SHELL was stamped between quotation marks until 1934
• Value (Estate): Unknown

• Value (Estate): unknown

• Value (Estate): 575.00 US $ • 391,20 €

• Value (Estate): 920.00 US $ • 580,20 €

• Value (Estate): 203.50 US $ • 132,70 €

• Value (Estate): 525.00 US $ • 339,80 €

• Value (Estate): 1,976.55 US $ • 1468,20 €

• Value (Estate): 150.50 US $ • 121,56 €

• Value (Estate): 565.55 US $ • 358,00 €

• Value (Estate): unknown

• Value (Estate): 235.00 US $ • 187,50 €

• Value (Estate):130.00 US $ • 95,10 €

Rare variation of the Vernon patent: The snap-in tenon is fixed to the stem rather the shank (enlarged view).
• Value (Estate): 143.91 US $ • 111,95 €