M31 Mini Retro Vertical Single-cylinder Reciprocating Steam Engine Model Toys

M31 1.8CC Retro Vertical Single-Cyl Double-acting Steam Engine Model w/ Reducer

M31 1.85CC Vertical Double-Acting Steam Engine Model – Brass Mini Engine

M31B 1.8CC Mini Retro Vertical Single-Cylinder Double-Acting Steam Engine Model

M31 1.8CC Retro Vertical Single-Cyl Double-acting Steam Engine Model w/ Reducer

ENGINEDIY M31B Mini Retro Vertical Reciprocating Steam Engine Model

1.85CC Mini Retro Vertical Single-cylinder Reciprocating Steam Engine Model Toys

M31B 1.85CC Mini Retro Vertical Reciprocating Double-acting Steam Engine Model