Early Dietz tubular model only marked TUBULAR on back of fount.
Features - Sherwoods 1877 patent of the blowhole invention. 
J.H.I.( John Henry Irwin) brass no.1 burner 
Fixed chimney - no lift system
Floating globe plate with match hole.
Condition  - excellent condition for its age .
No rust or pitting present 
No lose solder.
Shelf ready condition. 
** has not been oil tested **