DIARM did make a SxS side lock with the model designation Derby. This is from a DIARM catalog from 1986:

https://hosting.photobucket.com/images/mm122/Kyrie_Ellison/Page_2.jpg

The DIARM Derby was usually marked as if it had been made by Sarriugarte.

That said when it comes to Spanish artisanal shotguns the markings on the top of the barrels is advertising. Manufacturing data is found on the barrel flats and water table. "Daray" may be a meaningless model name chosen by the gun's retailer.