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Not all early movements have a date code symbol on them.  The period where this is common is around 1924-26ish.  The "Bulova Watch Co" movement signature was used from 1924 on.  There may have been some early 1924 movements made with the "Bulova W Co" signatures, but I don't think so.  So the movement dates 1924 at earliest (and lacking a date symbol). The "Bulova Quality" inside the American Standard case suggests 1924 or later also.  The earlier American Standard cases made for (and probably by) Bulova lacked the Bulova wording.  As best as we can determine, American Standard may have been a partially owned subsidiary of Bulova in the late teens early 1920's, and became a wholly owned subsidiary of Bulova sometime in the 1920's...The transition from no Bulova on these cases to including Bulova w/ Am Std markings makes sense as a possible transition date to the wholly owned subsidiary.

The dials had variation which may or may not have resulted in a different model name.  ...and it's very difficult to determine if the band is original, as the bands are the first think to go.  It could have been replaces with a period-correct band, so unless we have an ad showing that band on a (very similar) watch, it's a safe assumption not to count it in the ID'ing process.