katch, go to the Luger Accessories Section, then to the sticky on Military Mauser Magazine Identification Technique and you'll find them for pistols.
The SE/37 is for the magazine only. Magazines didn't have the pistol WaA stamped onto the base when the Germans started using the 122 magazines.
SE/655 was used on the pistols from late 1939 to the later part of the 41 byf production.
SE/135 was then used for the remainder of the Mauser Military Production.
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