When I renovated my fine Levin parlor with rosewood at the bottom and sides I was very unsure how old it was. It has no serial numbers stamped. I hesitated between a very early Levin or a manufacture around 1920.
The riddle is approaching a solution when pictures of a Levin lute guitar marked MAY 9 1901, the oldest dating I have seen on a Levin apart from the mandolin guitar from the same year with number 244 that I renovated, just appeared.
This lute has exactly the same ink stamp as my parlor and the same pyramid bridge. It seems that Levin did not get started with his serial numbers on many of the first manufactured instruments. Some got number stamps like the guitar mandolin, others just ink stamps like my parlor and sometimes also as in lute an ink stamped date dating. It is also interesting that MAJ is spelled in English "MAY", Herman got the stamps from the USA.
I did a double check on the original braces in the bottom which were replaced during the renovation of my parlor, but there was no hint of markings. My parlor is very early, perhaps one of the very first to be made. In any case, hardly later than about 1902 and not 1920 as I thought before.