Exacct replica Motortechnic Mfg. Knucklehead cylinder head set small port 61 cu" ( blank set ) 1937 only  feature original cast iron. Head set include valve seats and Manifold srew nipple, primer plug boss has plug 
installed. Rocker brackets has a 90 Dergee V chape as original.
Brand is manufactured by Motortechnic Mfg. in Germany
NOTE: Head are casted with numbers 119-35  119-352 and MC sign like original.