Company Names, addresses, dates:
  John T. Cole & Co, 209 King St. (Peabody Building), Alexandria VA (1880-1887)^1,2
  J. T. Cole, 824 King St., Alexandria VA (1888-1892) ^1,4

Notes:
John T. Cole (1856-1925)³ was a druggist in Alexandria.
He was listed in the 1876 Alexandria City directory as a drug store clerk¹. He would have been 19 years old then. An ad in the Alexandria Gazette on May 22, 1880 announced the drugstore company of "John T. Cole & Co", as the successors to Jno. Y. Gibson & Co, located in the "Peabody Building"². Subsequent Alexandria Gazette ads starting in 1882 called out the address of the Peabody Building as being at 209 King Street.
In June of 1892, he closed out his business and moved to Washington DC, where he worked as a Doctor⁴. I find it odd that none of the newspaper articles prior to that date referred to him as a Doctor.

Bottles:

	book # 88 (in medicines section) This is a clear 3.6" bottle embossed: vertical slugplate: JNO. T. COLE & CO / DRUGGISTS / ALEXANDRIA, VA. base: W T & Co / *
	book # 87 (in medicines section) This is a clear 5.2" bottle embossed: horizontal: JNO. T. COLE & CO / DRUGGISTS / (mortar & pestle) / ALEXANDRIA / VA. base: PAT JUN 17 88 / S.B.
	book # (unlisted) This is a clear 3.6" bottle embossed: horizontal: JOHN T. COLE / DRUGGIST / (mortar & pestle) / ALEXANDRIA / VA.
	book # (unlisted) This bottle is a taller version of the one above. It is a clear 4.2" bottle embossed: horizontal: JOHN T. COLE / DRUGGIST / (mortar & pestle) / ALEXANDRIA / VA.

I don't know if this was the same building at 209 King Street that housed John T. Cole's drug store, but it's in the same location. The address numbers on King Street have changed, but according to a Sanborn map from 1885, this location (modern day 907 King Street) was numbered 209 King Street. Photo was taken June 2012.