Dincklage was born in Wilhelmshaven and, after completing his education, embarked on an officer's career in the Prussian Army, serving as the company commander of the 65th (5th Rhenish) Infantry Regiment, headquartered in Cologne.

In 1922, he joined the more far right and anti-Semitic German Völkisch Freedom Party (DVFP), co-founding the Hanover branch and being elected as a member of the city assembly.

[1] In early 1925, Dincklage joined the Nazi Party when the ban imposed on it following the Beer Hall Putsch was lifted, serving as the business manager in the Hanover local office.

In March 1925, Dincklage was appointed Deputy Gauleiter and Gau-SA Führer of the newly formed Gau Hanover-North, and also continued to head the local Hanover office until 1929.

Together with Rust, Dincklage in September 1925 became a member of the National Socialist Working Association, a short-lived group of northern and western German Gaue, organized and led by Gregor Strasser, which advocated for non-participation in electoral politics, unsuccessfully sought to amend the Party program and was dissolved in 1926 following the Bamberg Conference.

In a December 1927 letter to a Nazi Reichstag deputy, Franz Stöhr, he wrote: "In full agreement ... that we shall not yet succeed in winning much ground from the Marxists in the coming election.