Well kjohn, very interesting unit and I'll break it down to the best of my knowledge. None of the numbering (except the receiver of course) is original to a type 2 svwMB and it has to have gone through a French rework. The bolt serial looks French in style. It was typical of the French reworks to have scrubbed and renumbered bolts in them with only the last 3 digits of the serial applied to the bolt body. The trigger guard and floor plate are interesting though. A typical French rework would usually only have the last 3 digits stamped in them and not the full serial like yours but the late svw trigger guard has been modified for the locking screw, which is correct for a French rework, so I'm thinking this is just a different variation in numbering. It's also interesting that the tg only has a single e/135. Trigger guards destined for in house use should have 2 e/135's and single accepted were for sales to other makers. Could be a factory error or just a tg that never made it to the final acceptance and thrown into French production.
So basically what you have is a German built and proofed svwMB receiver/barrel that was then reworked by the French post war. It's a shame it got reworked as an original type 2 would be worth a lot more but it's still a very neat piece of history and collectible for sure.
Thanks for showing!