Walther made a number of sporting rifles in the post-WWII period. Yours sounds like the basic KKJ model, a very nice rifle. There are variations, but yours seems to be the basic KKJ.
The "lfb" is part of the caliber marking; it stands for "lang fur buchsen" or "long rifle". "Ulm/Do" is the post war location of the Walther factory, the city of Ulm am Donau (Ulm on the Danube) in Germany.
Not many were imported and one in near new condition can bring $1000 or so from the right buyer.
Jim
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