"9436" stamped on the right side of the pipe matches the GBD shape number for a straight billiard. The "London England" phrase on top of the number would confirm a GBD origin rather than a Salmon and Gluckstein Ld. production.

Sven Bang opened his tobacco and pipe shop in 1968 in Copenhagen. He was more a business man than a pipe carver and began to hire pipemakers. About half a dozzen succeeded each other in his workshop during the 1970's (Ivan Holst Nielsen, Jan Wideløv, Phil Vigen...). At least Per Hansen and Ulf Noltensmeier stayed and when Sven retired in 1983 they took over the company (in 1984) keeping its name.
Production: ~ 500 pipes/year
Stampings: The pipes are not necessarily stamped with the year of manufacture nor with Ulf's or Per's signature.
European pipes grading (ascending): Black blast, Tan blast, 5, 6, 7, 8, 9, A, B, C and D (very rare)
US market pipes grading: no grading. The pipes bear a code. i.e. "9736": 36th pipe made in 1997

 

Artisan: Sadik Yanik

▲ Pipe probably crafted by Savinelli

The S.S. Pierce & Co brand get out of business in the early 80s and dates back to at least 1831.

Brand of Wenhall Pipes Ltd (a pipe distribution company) for italian crafted pipes.
Other brands with a hat logo:
Churchill, Lobbia, London Royal, Man-About-Town,

Georges Sachs was a tobacconist from the 1920's to the 1940's

Artisan: Yukio Okamura (born 1950) carves pipes entirely by hand since 2000 with a one year interruption in 2008 due to a broken shoulder.

 

Leather clad pipes

Artisan: Bertram Safferling
Production: ~ 250 pipes/year
Grading (ascending): 1-5 and "A" (rare)

 

▲ Red star logo

▲ Shooting star logo. ▲

Brand founded in 1980.
Address:
Arpacılar Caddesi No:6 Anadolu Han Kat: 1 No:3/8 Bahçekapı/Eminönü İstanbul Türkiye

Rather rare: a stamped horn stem.

 

The maker of this spanish brand is unknown. (Any information would be wellcome)

▲ On top of mouthpiece: "S" logo.
Can be interpreted as two bent pipes.
On left side of mouthpiece: huge briar disk

▲  This pipe posseses a light color wooden stem which obviously cannot be briar. May be Boxwood or Lemon.

Bosc (Catalan language): forest

Brands having produced pipes with briar stems: Barnaby, Il Ceppo, Kaywoodie Allbriar, LHS (Purex Allbriar)

Factory founded in 1883, closed in 2001. During its best period Salvatella produced about 150,000 pipes/year.
See also Sigmund, Mc Intosch