The designation SM UB-133 does not correspond to a widely documented or recognized subject in established reference works. Consequently, reliable encyclopedic sources provide no substantive information about a specific vessel, organization, or concept bearing this exact name.
Possible Contextual Interpretation
- SM: In German naval nomenclature of the Imperial era, the prefix “SM” (or “SMS”) stood for Seiner Majestät (“His Majesty’s”), indicating a warship of the Kaiserliche Marine (Imperial German Navy).
- UB-133: The “UB” series refers to a class of German coastal submarines (U‑boat type) produced during World War I. Numbers in the 130s were assigned to later units of the Type UB III series, many of which were laid down in the latter stages of the war and some were never completed or commissioned.
Summary
Given the absence of verifiable entries in standard encyclopedic sources, SM UB-133 appears to be an obscure or possibly erroneous reference, likely intended to denote a German Imperial Navy submarine of the UB‑III class that may have been planned or partially built but for which no detailed historical record is readily available.
