Eckermann of Muskegon, Michigan.

Well, what set me off on this is a bottle I got. 
Here's a bit modified version of what I typed into the bottle forum I'm a part of, as I had done some digging into Eckermann:

I believe the name of the druggist until after The Great Pine Street Fire of 1891 (Muskegon) was Alexander Heinrich Adolphus Eckermann from Germany (sources claim the same man from two different cities there.) He isn't present in Muskegon's 1894 Census. 

Coming to Michigan, he fought in the U.S. Civil War with-- I believe-- the 3rd Michigan Regiment (Although an Alexander Eckerman [one n] fought with the 8th Regiment, Michigan Infantry.)

Afterward, he settled in Grand Rapids with several drug stores till he picked up and left to start his druggery (made-up word) in Muskegon in 1881. 

After the 1891 Great Fire, in which his and 250 other businesses burned, he seemed to have been down for awhile.

Then, in 1907, a Muskegon Druggist under the name Alexander Eckerman (one n now, not two,) pops up in a directory under the section titled "New Businesses." 

Eckerman (one n) dies on April 4, 1918.
The obituary claimed 37 years of druggery (presumably Muskegon,) and 1918 - 37 = 1881.

I discover soon after that Eckermann (2 n's) dies April 4, 1918.

The bottle itself says on front:
A. ECKERMANN 
PINE ST. DRUG STORE
MUSKEGON, MICH. 

And the base:
W. T. & Co.
E

Made by W. T. & Co. (Whitall Tatum & Company,) the "&" was taken out of the name in 1901 by the glass-maker who specialized in medicine bottles  from about 1875 till they turned to insulators in the early 1900s. They ended insulator production in the 1970s, if I recall correctly. 

BINGO. 

It leads me to believe he changed his name between 1891 and 1894. 

Just thought I'd throw this up as nothing is yet on here for an Eckermann.