Just my humble try:

"Double rifle by George Gibbs, Bristol. Made probably around 1930 (exact date can not be confirmed, as all the manufacturer’s documents from this period have been destroyed). The calibre is 5.6 x52R (Savage) and it is original (see stamp). Breech is tight. With ejectors. Barrel length 53,5 cm, barrels in mint condition. Original stock (length 36,5 cm - LOP) made from beautifully grained wood and with vividly engraved metal pad. Hinged pistol-grip cap. Very well preserved engravings. Mounted with Kahles 2-7x, with dual set (horizontal and vertical adjustment) reticle (German No 1) - soldered “Schwenk” mount. Total weight with scope is 3.8 kg. Total length 95 cm. With additional original auxiliary optics (with the manufacturer's name engraved). Original leather case, that was only adjusted for the scope. Straps have also been renewed. It is a very handy and very well preserved rifle with just a few scratches."

IMO "auxiliary optics" are binos with some kind of mount - I guess just to spot on the range?