Thanks for posting but it appears you have received replies via a posting on another forum. Those post did not mention that S B & G Co. is the mark of Streator Bottle and Glass Co. of Streator, IL which was in business from 1881 to 1905.
Your Hutchinson soda bottle appears to be exceptionally clean and I wonder if it has been tumble polished...
Yours appears to be a variant yet undocumented on account of the base embossing. See http://www.hutchbook.com/Bottle%20Directory/HutchSearchResults.aspx?Primary_Name=missoula&Manufacturer=&City=&Color=&County=&Mold_Type=&State=&Plate_Type=&Territory=&Pictures=&Region=&Start_Height=&End_Height=&Country=&Start_Width=&End_Width=&Bottle_Number=&Start_Marked_Year=&End_Marked_Year=&Sub_Categories=&Shape=&All_Embossing=&Rarity=&Front_Embossing=&Added=&Back_Embossing=&Updated=&Base_Embossing=&Comments=&Find_Hutches=Find+Hutchinsons&Source=Attributes
I am sure the author of that website would like to include your bottle in his directory - get in touch with him.