[Stellan Bojerud (RIP)]

Prototype made in 1932. Export were later made to:

DENMARK Ff.K M.33 and M.37
An unknown number bought from Bofors in 1933 as Fodfolkskanon (Infantry Gun) M.33.
Later produced in Denmark by Haerens Vaabenarsenal as M.37.

FINLAND type 37 PstK/36 Bofors
114 bought from Bofors
42 supplied from Germany (ex- Polish guns)
355 made in Finland by Valtion Tykkitehdas (State Arms Factory)

GERMANY 3,7 cm PaK 36 (p) and 157 (d)
Great numbers captured in Poland and Denmark

GREAT BRITAIN Ordnance 37 mm Q.F. Mk 1
80 taken over from Sudan Defence Forces.
Used by 3rd RHA, 112th RHA, LRDG and in Somalia

EDIT: The Somalia connection is just a rumor. According to Bofors archieves 250 were ordered by GB. 80 delivered.

NETHERLANDS
12 bougt from Bofors 1935
Production in NL not known

EDIT: Wrong, these 12 were for Armoured Cars made by Landsverk in Sweden.

POLAND type 37 mm wz.36
300 bought from Bofors 1936
900 or more made by Stowarzyszenie Mechanikow Polski z Ameriky
Poland exported guns

ROMANIA
556 guns supplied by Germany or brought by Polish troops seeking refuge in Romania

SOVIET UNION
Unknown number Polish guns captured

SPAIN (Franco Nationalists)
Unknown number bought from Poland

EDIT: Other sourse says 30 to the Republicans aka "Peru" 1938.

SUDAN
250 (?) bought from Bofors of which 80 delivered

EDIT: Wrong according to Bofors.

SWEDEN 37 mm pvkan m/34 and m/38
12 m/34 delivered 1935
491 m/38 delivered 1939-43

TURKEY
Details not known

YUGOSLAVIA
Details not known

Picture: Polish gun captured by Germany.