The Krupp 7.5 cm Model 1903 was a field gun used by Denmark and the Netherlands in World War II. It also formed the basis for the Type 38 75 mm Field Gun used by Japan. In Danish service it was known as the 03 L/30 and doesn't appear to have been modified in any significant way before World War II.
The Dutch bought some 204 of the slightly earlier Kanone M.02/03 and purchased a production-license as well. 120 appear to have been manufactured in the Netherlands, where it was known as the 7-veld. During the Twenties, the Dutch rebuilt their guns to increase their elevation. At least 16 were modified for motorized traction, presumably with steel wheels and pneumatic tires, for service with the Light Division. Gander and Chamberlain claim there were three almost identical versions, the M 02/04 vd, OM 04 and NM 10, but this has not been confirmed. The Germans designated these guns as the 7.5 cm Feldkanone 243(h) after the Battle of the Netherlands.
Danish guns were known in German service as the 7.5 cm Feldkanone 240(d).
References
Chamberlain, Peter & Gander, Terry. Light and Medium Field Artillery. New York: Arco, 1975
Gander, Terry and Chamberlain, Peter. Weapons of the Third Reich: An Encyclopedic Survey of All Small Arms, Artillery and Special Weapons of the German Land Forces 1939-1945. New York: Doubleday, 1979 ISBN 0-385-15090-3