Max Borho / August Zinkl / G.F. "Fritz" Thenn.
Regensburg, Bavaria.
Hersteller / Manufacturer
Partnership: Max Borho & August Zinkl: 1874-1875.
Partnership: August Zinkl and G.F. "Fritz" Thenn: 1875 - 1877.
Finally sole trader: G.F. "Fritz" Thenn: 1877 until ceased trading in 1886. The company assets were sold to Heinrich Waffler II.
References: MySteinCollection Irmgard und Werner Endres Regensburg Address books Irmgard und Werner Endres, pages 384/385 + 394
Stein #183 by Fritz Thenn , with pewter lid, mounted with clear jewel at top. 
Basemark on featured stein above. 
More legible basemark as above 
A stein of later production again with the capacity mark is at the front, denoting a Regensburg stein. 
Small stein #261 without a capacity mark. 
Weihnachten (Christmas) 1880 dedication on the lid of the above stein. 
Basemarks on the above stein. 
"Gambrinus" relief stein. This stein is early production from between 1874 & 1877. N.B. The capacity mark is at the front, further denoting a Regensburg stein. Note the 1LJ cap mark. 
The conjoined "T" & "F" in a circle, denoting Fritz Thenn, dated 1877 - 1886. 
1 litre Fritz Thenn stein, dated 1877 - 1886. N.B. The capacity mark is at the front, denoting a Regensburg stein. 
Unuaual basemark on 1 litre stein, immediately above. 