Keith, thank you for this end of summer puzzle - never thought I should investigate this bottle!
Found interesting pages CV of K.A. Lingner, inventor and manufacturer of ODOL
http://lingner-archiv.jimdo.com/ ODOL for collectors' page states that without original label it is nearly impossible to date the bottles. Lots of photos of different labels there
However, bottles with screw cap are post 1936 which means that yours is PRE 1936 (same as mine, my smaller 'travel size' bottles with Bakelit cap are younger).
The archive does not mention the base mark at all
Bottles (Patent 75789)
quote
Unbestritten stellt die Form der Odol-Flasche eine einmalige Synthese zwischen Funktionalität, Design und Wiedererkennungswert dar.
(google translate: Undeniably, the shape of the Odol bottle represents a unique synthesis between functionality, design and brand recognition.)
unquote
manufactured by:
at the start: Glashütte von Münzel & Palme in Röhrsdorf,
from 1895 Glashütte Trassel in Ober-Warmensteinach und in Schönthal (Bohemia)
from 1906 in Immenreuth
Furthermore, the Lingner works possessed glassworks in Brand-Erbisdorf and in Bodenbach.