Rare M31 canteen marked HRE 43

Rare M31 canteen marked HRE 43 indicating production by Heinrich Ritter, Esslingen. This is a rare canteen considering Ritter switched 100% to producing coconut type canteens exclusively in 1943. The flask and felt is marked HRE 42, but the lid is marked HRE 43 indicating it was produced in early 1943, surely one of the last M31 canteens they produced!