Company Names, addresses, dates:
  Monarch Bottling Co, Washington DC

Notes:
I can't find Monarch Bottling Company in any Washington DC City directories or phone books.
A web search reveals a "Monarch Bottling Company" in many cities, including one in Georgia that bought the Moxie soda company. I'm not sure if all there was one single Monarch Bottling company, or if there were many companies that went by that name.
A February 1927 blurb in the Washington Post said that the Monarch Bottling Company was opening an office in Arlington VA.
I don't know why one of the bottles below says "MONARCH" and the other says "MONARCO".


Bottles:

	book # 418 This is an 8.3" clear machine-made crown top bottle embossed: front: MONARCH BOTTLING CO / MONARCO / REGISTERED / WASHINGTON, D.C. back: CONTENTS 8 FL OZS base: M
	book # 419 This is similar to above, except it says "MONARCH" in the middle instead of "MONARCO". It's an 8.3" aqua machine-made crown top bottle embossed: front: MONARCH BOTTLING CO / MONARCH / REGISTERED / WASHINGTON, D.C. back: CONTENTS 8 FL OZS base: M