Peake No.1 is a limited edition of 20 engines of a very interesting design, this being serial number 5. The main engine frame is a casting and is mounted on a wood base. It has a rotary valve built into the crankshaft. The main bearing is fitted with a tiny glass oiler.
The single acting cylinder is 11mm diameter and 12.7mm (1/2") stroke. The small end of the con rod is inside the piston, as is common in internal combustion engines but unusual in steam engines.
The bottom picture on the left is a scan of a "Certificate of Authenticity".