there isn't a rifle more teutonic and less british then a fine M 88
sporter and you see that the guy at holts was not realy familar with this:

MUN. & WAFFENFABR SOMMERDA
A 7.9mm BOLT-MAGAZINE SPORTING RIFLE, serial no. 37531,
24in. octagonal to round nitro barrel with ramp-mounted blade
fore-sight, rear-sight of one standing and one folding leaf, fitted with
a 6x42 telescopic sight in quickly-detachable mounts, set triggers,
retaining some original colour-hardening and finish, semi-pistolgrip
stock (cracked and pinned at head) with schnabel fore-end tip,
cheekpiece, ammunition trap, leather sling, 14 1/4in. pull
Estimate £300-500

http://auctions.holtsauctioneers.com/asp...no=&image=0

this one is a M 88 , the caliber will be the 8x57 I and the ammunition trap is a clip trap. you can remove the ammunition only on the top of the magazin.
Munition und Waffenfabrik Sömmerda AG is a interesting detail. I dont know that this name was used before the dead of Franz von Dreyse in 1894. when Rheinmetall bought the former Dreyse factory in 1901 it was becoming Rheinmetall Sömmerda( you will find collector cartridges with the "RMS" headstamp). Heinrich Ehrhardt, the founder of Rheinmetall had learned the gun business once from Nikolaus von Dreyse, the inventor of the brecch loading rifle.
this M 88 looks like a Suhl made sporter but the Dreyse factory in Sömmerda is close enough to the Suhl area that I dont see a problem why they dont have made this also. style and quality of Dreyse sporting rifles is very close to other Suhl rifles and everything I have seen from Dreyse was allways of top quality.