The earliest Autavias, with the first execution case (screw-back) and first execution dial, are easily recognized by the large registers. The first execution case / first execution dial is the only version of the Autavia with the larger registers.  There are three versions of the first exection case / first execution dial Autavias:<UL><LI>Reference 2446 (three registers)<LI>Reference 3646 (two registers) -- 30 minute recorder<LI>Reference 3646 (two registers) -- 45 minute recorder.</UL>
The Autavias with first execution case and dial are rare, and highly valued by collectors.  We maintain a <a href="http://www.onthedash.com/docs/AutaviaRegistry.html" target=_blank>registry of the first execution Reference 2446 Autavias</a>, which provides additional information about these watches..