The double rifle appears to be a 9.3x72 from the seller's descriptopn. It has nice engraving. The seller's description are somewhat limited and are as follows:

This is a Guss Stahl Krupt Essen W. Weisgerber Prima SxS Double Rifle, with a 24” barrel. I’m not sure what this really is. Any info anyone has would be appreciated. I cannot figure the caliber of this rifle. Trying different bullets, chamber is bigger than 223 but smaller than 308. Barrel bore in very good condition. Bluing is probably about 90% with minor small marks visible in the pics. Top of barrel is stamped W. Weisgerber/St. Wendel. Monte Carlo fine wood stocks are very good with age appropriate minor handling marks. Stock has ammo storage compartment. Receiver has some real nice engraving. Other internal barrel stampings are: 2,7 gGBP, 118/35. This is a quality double rifle. Gun has not been test fired. Pictures show the condition of this gun. Estate sale. AS IS NO REFUNDS. Ask questions before bidding. SN 5255 Store Stock #16807

I would post pictures but never figured out how that is done. I need a 10 year old to show me.