Weldeen,
* My welcome to the Lugerforum as well.
* Your holster was likely made by the firm Ruffel & Borns of the city, Hannover in 1936. Usually, in the near vacinity of the maker's stamp, is an Army Inspector's acceptance stamp. This consists of an eagle surmounting a globe encircling a swastika. This over the Heereswaffenamt ID stamp of WaA###. The Army inspection team covering the Hannover area was WaA330 during the 1936 time frame.
* Both mags once belonged to other Lugers as they do not bear the same number/suffix letter block of your pistol. The "1291" mag likely once belonged to a Police issued luger made approximately the same time as your Mauser Army pistol; ie late 1939.
* Pictures of the many styles of lower case alpha letters used in conjunction with the S/N's can be found in the Technical Information" section of this Forum if you entered with the URL
http://www.lugerform.com
* Clear digital or scanned pictures of the unidentifiable marks you mentioned, posted into this thread, would aid us all in providng you additional information on your pistol rig.
Respectfully,
Bob