Company Names, addresses, dates¹:
  P.L. Keyser, B south n 3rd East (1865)

Notes:
The only year P.L. Keyser shows up in Washington DC city directories is 1865. He was listed as a "mineral water manufacturer".
The September 12, 1864 issue of the Washington DC Evening Star newspaper on page 2 had an entry that said a group of bottlers (including P.L. Keyser) had agreed to charge "northern prices" of 60 cents per dozen bottles of Porter, Ale, Cider & Mineral water. So Keyser was in the bottling business in 1864.

Bottles:

	book # 348 This is an aqua 6.75" tall, squat bottle with a double collar applied lip, embossed: front: P.L.KEYSER / WASHINGTON / D.C. back: THIS BOTTLE / IS NEVER SOLD I've painted some of the embossing with water colors to make it stand out.
	book # 349 This is an aqua, 7" tall, short-blob bottle, embossed: front: P.L.KEYSER / WASHINGTON / D C back: THIS BOTTLE / IS NEVER SOLD I included a front-lit view with the embossing painted with water colors, since the embossing is so weak.