[crago]

I'm trying to get some information on a Walther cal. 22 that a co-worker has shown me.  We can't find anyone that has replacement parts or can tell us the model number.

I've attached an image which hopefully will help.  Other markings on the top of the bolt include the following:
Carl Walther Ulm/Do. Sportwaffenfabrik

Any responses will be greatly appreciated.

Thanks,

Steve