Reinsman Serial Numbers
For a trail saddle -
The first 4 digits tell you what saddle.
The first number after the dash tells you what kind of seat (Full or Bicycle).
The next two number the seat size.
Then the leather color code.
The numbers after that are date of manufacture.
Whatever style of saddle the 4101 dictates - Full Seat 17" M color (mahogany/rosewood probably) - and the 08.08 is August 2008.
Hope this helps.
You can call Reinsman too and they can tell you exactly what it is.