I'm not really sure where to play this horn. It looks to be a very early stencil of a 1000 Series. 

I have put it under the Transitional category for the time being. 

  • left hand palm keys left hand   palm keys
  • left side lower portion left side lower portion
  • left side mid section left side mid section
  • right side mid section right side mid section
  • right side neck attached right side neck attached
  • right side upper portion neck attached right side upper portion neck attached