This very nice DWM commercial Luger with matching grips and magazine is in the collection of the Canadian War Museum as Artifact 1306478.
Sadly, not much is listed about how it got there other than it is associated with the F-class destroyer HMCS Saskatchewan, formerly HMS Fortune (H70) of the Royal Navy.
Saskatchewan was very active during WWII including sinking at least one and maybe two U-boats while in British service and a German patrol boat off Normandy while under the Canadian flag. Of course, as it is a commercial gun, it could have simply belonged to a crewmember rather than picked up as a capture.
As a related point, Saskatchewan‘s bell is on proud display at the Vancouver Island Military Museum in Nanaimo and her name was recycled for a Mackenzie-class destroyer, DDE 262, which was active throughout the Cold War.