Company Names, addresses, dates¹:
  Trim Beverages, 500 Penn St NE (1961)

Notes:
Trim Beverages was bottled at 300 Penn St NE, which was also the home of the Rock Creek Ginger Ale Company. "Trim Beverages Inc." shows up by itself in the 1961 city directory, but in other years during the 1960s Trim diet soda was bottled by the Rock Creek company.
An article in the Evening Star in 1965 said the Rock Creek bottling company mistakenly put out over 1000 cases of their normal (high-calorie) sodas in Trim low-calorie Diet Cola bottles, and had to recall them².


Bottles:

book # 682 This is a stipled, aqua 11.1" crown-top bottle with a red and white applied color label: front shoulder: 16 OZ / 1 / CALORIE / PER / 6 OZ. SERVING shoulder: TRIM / diet / COLA rear shoulder: 16 OZ / TRIM / diet / COLA rear: FLAVORED DIETARY BEVERAGE / CONTAINS ... / BOTTLED UNDER AUHTORITY OF / TRIM BEVERAGES, INC. / WASHINGTON, D.C. embossed on base: G20031 30 63