The watches in the Engine line are distinguished by an exposed NH27 automatic movement with a ruthenium skeleton. The brand and line logo can be seen on the inside of the crystal. This model comes with a leather strap, a rubber strap and a screw-lock for interchangeability.
I found Iguana really friendly, helpful and efficient to both buy the pen and when I had a query - very quick to respond. The pen is gorgeous and I’m now using it every day.