Company Names, addresses, dates¹:
  Henry Otto, 707 8th street NE (1887-1889)
  Henry Otto, 640 C street NE (1890-1921)

Notes:
Henry Louis Otto (1861-1938)² was born in Maryland.
The 1880 census listed his occupation as working in a mineral water factory. I suspect the factory he worked in belonged to George Otto , who was listed in the 1880 census as living in the same house as Henry but was head of a different family. So George was possibly Henry's uncle or older brother.

In March 1884, he left his job as foreman of the George Otto bottling company (which was owned at the time by George's widow Elizabeth)³. This was presumably so he could start his own bottling establishment.
While his bottling establishment doesn't show up in city directories until 1887, he is mentioned as a bottler of Ginger ale at the corner of 5th and C streets S.E. in the Historical & Commercial Sketches of Washington, compiled by E.E. Barton in 1884. That book also says that Otto's establishment was 30 x 100 feet, that he employed 4 assistants, and had 2 wagons to deliver his goods. It says he manufactured ginger ale, sarsaparilla, soda and a large number of light summer drinks.⁴

In 1889/1890, he moved to 640 C Street NE.
Henry's 1902 estimated pecuniary strength was $3000-$5000, and his credit rating was "good".⁵


Bottles:

	book # 473 This is a 6.5" aqua hutchinson bottle, embossed: round slug plate: HENRY OTTO / WASHINGTON / D.C. The word "WASHINGTON" is in a wavy pattern.
	book # 474 This is a 7" aqua hutchinson bottle with 10-sided base, embossed: tombstone slug plate: HENRY OTTO / 8TH ST / N.E. / WASHINGTON / D.C. base: No 1
	book # 476 This is a 7" aqua hutchinson embossed: round slug plate: HENRY OTTO / TRADE / HO / MARK / 640 C. ST N.E. / WASH. / D.C. back: REGISTERED NOT TO BE SOLD
	book # 477 This is similar to the above bottle, but without the trade mark. It is a 7" aqua hutchinson, embossed: round slug plate: HENRY OTTO / 640 C. ST N.E. / WASH. / D.C. back: THIS BOTTLE / NOT TO BE SOLD
	book # 479 This is a 6.5" aqua hutchinson with a 10-sided base, embossed: round slug plate: HENRY OTTO / WASHINGTON / D.C.
	book # 480 This is an 8" clear BIM crown-top, embossed: oval slug plate: HENRY OTTO / 640 C. ST. N.E. / WASHINGTON, D.C. below slug plate: THIS BOTTLE NOT TO BE SOLD
	book # 480 This bottle differs from the one above in that it's got a round vs oval slug plate. It is an 8" sun-colored-amethyst (SCA) mouth-blown crown-top, embossed: round slug plate: HENRY OTTO / 640 C. ST. N.E. / WASHINGTON, D.C. back heel: THIS BOTTLE / NOT TO BE SOLD
	book # 480 This is an 8.5" aqua BIM crown-top, embossed: oval pattern: HENRY OTTO / 640 C. ST. / N.E. / WASHINGTON, D.C. above oval: REGISTERED below oval: THIS BOTTLE / NOT TO BE SOLD