Monarch
- A single cylinder, double acting vertical engine
- Slip eccentric or Stephenson's reversing valve gear
- Construction series Engineering in Miniature May 1980 - Oct 1981
- Length: 3 3/4"
- Height: 5 5/8"
- Width: 3 1/2"
- Cylinders: 3/4" bore x 3/4" stroke
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