As said there is a lot of information on this watch if you use the search tool of the forum ( the spy glass) and type : "cal. 67, military".
The essention for collectors of this watch is the case numbering. The case number as well as the number on the steel cap inside should be identical to be the "real stuff". You mention a case number : 1081101.
The movement number is always older and dates often from before 1940.
The case number 1081101 belongs to the first series of 4 series delivered to Gerl and Schipper in Cologne, Germany. The first series existed of 1500 watches and was delivered from January 13 until December 1, 1943. Gerl and Schipper were civilian whole salers who represented IWC in Germany at that time. They provided the watches to the German Navy ( Kriegsmarine). Another 3 series were delivered to them until November 8, 1944, making a total of 2500 watches. There are few left. Many were lost during action on the war ships. Some were returned and de-nazified by the German Navy "Bund" and got a Nato Stock Number on the case back. Many were " put together" by using the movements and cases and steel caps from different watches and some were denazified by polishing the Swastica on the case back or "k.m." was erased on the dial. An authentic watch has the tripple value of a "marriage".