I'm not familiar with Threemor but I did find this-
This rare Threemor soda bottle measures 8" tall. It has the name molded into the bottle. Around the bottom edge of the bottle is molded: 6 FL. OZ. REGISTERED. Threemor was a chocolate soda drink.
The bottle was made by Three Rivers Glass Company, Three Rivers, TX. Three Rivers was located in South Texas. The company was in business from 1922 - 1937 and was eventually bought by Ball Brothers Glass Manufacturing Company. Three Rivers Glass Co. also made bottles for Nehi, "It", Delaware Punch, Nicholson Brand, Kraus Bottled Purity and Royal Crown Root Beer. This bottle is over 75 years old and and in excellent condition with no chips or cracks. The only markings on the mottom of the bottle are "N-W".
It sold for $9.99