Hello Robby,
Welcome to the Luger Forum. If your 1929 W+F Bern w/ brown plastic grips is as nice as the one shown in your photo posting, you will have a fine Bern luger. I have posted four (4) photos below to help answer some of your questions.
This information and photos are taken from the very nice Swiss luger book written by Mr. Vitorrio M. Bobba, tiled "Parabellum - A Technical History Of Swiss Lugers". If you get a chance to buy this book new or used, you should do so. It is a large over-sized book with lots of beautiful photos of museum-quality swiss lugers. This book runs ~ $ 100.00 USD in new condition and is still sold through book sellers.
Onto your questions :
1. The serial number of your pistol (# 59668) places its production in the year 1940. A total of 2,420 lugers were made in 1940. Please see photo # 1, below, for data. Mr. Bobba also states that from 1929 to 1938 or 1940, most Bern lugers had red plastic grips and magazxine bottoms. In 1938 or 1939 through 1942 or 1943, Bern switched to brown plastic grips and magazine bottom. In 1942 or 1943, Bern switched to black plastic grips and magazine bottoms. So your luger "should" have brown "trim".
2. Photo # 2 shows the "cross/M" stamp mark you mentioned. This was the inspection stamp of the main Bern inspector, Colonel Muhlemann who worked and stamped pistols at Bern from 1929 through 1941. Again, you have the "correct' inspector's stamp for a 1940's produced luger with brown trim.
3. Photo # 2 also shows a "P" stamp mark. This is a stamp to signify the luger was released by the Swiss service (either military or police) for "private" sale to the public. The position of this "P" stamp varies on Berns; and having it stamped on the front of the trigger guard is one "official" location. Sometimes the stamp is only a "P" as your pistol has; others might read as "P-58" (or other dates...) which is meant to convey the gun was released for privatization in the year 1958.
4. Photo # 3 shows the front frame well of a Bern luger (at the far right-side of the photo).
5. Photo # 4 shows this front frame well in detail. In this photo you will see "6.40" stamped at the bottom of the well. This confirms the gun in the photo was produced in June of 1940.
When you get a chance, take-down your Bern and look in your front frame well. This will confirm the exact month in the year 1940 your pistol was made.
Sorry to have written so much...hope this info. is of help to you.
Be sure to post photos when you get your new Bern home !!!
Regards,
Pete... <img src="graemlins/yltype.gif" border="0" alt="[typing]" />