That is a beautiful gun. Your Daly "Three barrel Gun" (Drilling) is technically a model 105. The model 105 retailed for $75 in 1899. The hammelress variety went for $200 at the same time.

Every Daly drilling I have ever encountered has been a Sauer gun - others may have also produced drillings for SD&G, but I have never seen one.

Looking through a few period SD&G catalogs I see that, depending on the year, the gun was offered in a choice of calibers including "32 and 38 W.C.F", "38/55", "30-30". It was also offer in 45/70 with 10 gauge tubes.

Enjoy your new gun.

Ken