Martinstraße 30, Altstadt, Cologne, Rhine Province or Rhenish Prussia, Prussia (now North Rhine-Westphalia)
Porzellanmalerei & Keramikwarenhandel. / Porcelain decorator & Ceramics Wholesaler.
H. Rang had his premises in Coln-Altstadt (the Old Town) just across the river Rhine from the district of Coln-Deutz
where the troops, who purchased the steins, were garrisoned.
Known dates: 1897 - 1915.
The German spelling for Cologne, varied over the years. So in 1900 the Prussian Minister for Interior Affairs, issued an edict that the correct spelling for
Cologne was Cöln. However, on the 1st February 1919, the mayor of Cologne, Konrad Adenauer, stated the official name was again Köln.
But as can be seen, most people continued to use the spelling they preferred.
Purchased stein bodies from: Merkelbach & Wick
Reference:
Side view of the featured stein"Bald ertonet das Signal dann haf Reserve Ruh"4 C P. Westphalian Pioneers.
Detailed close up of the lid of the featured stein above. 
Regimental dated 1897. Köln spelt with a "K".
Regimental dated 1909. Köln spelt with a "K". 
Stoneware stein by Merkelbach & Wick "Rheines Strande dienten wir 2 Jahre treu als Pionier". "We served faithfully for two years as pioneers on the Rhine beaches". Reservist dating 1903 - 1905.
"3rd Eskadron. Kürs. Regiment. Graf Gessl rhn. no.8. Deutz". Stein with impressed base mark of Merkelbach & Wick. Decorated for Gefreiter Kramer, winner of the 1st Karabiner Schiels Preis, dated 1902. 
Side view of the featured stein "Pionier das schwarze Thor tut sich alle Andern vu?" Battalion No.7 Cöln - Deutz 
Signature on the base of the above Regimental stein
Decorator's signature on featured stein (left), dated 1902. 
Stein manufactured by Merkelbach & Wick. Köln spelt with a "K". 
3 Esk. 2 Westf. Ulanen Regt. No. 5, Düsseldorf, dated 1912 to 1915. Cöln spelt with a "C". 