This is an original 1950s Telu Log that was owned by my dad when he had his Morris Minor.
The Telulog enables the motorist to keep a log of the fuel and mileage using the rotary dials, and was available in the 1950s and into the 1960s.
Before starting a journey, the last three digits of the car's mileage would be recorded on the Telulog, and as fuel was purchased, this was recorded as required. At journey's end, the distance travelled could be calculated by deducting the initial mileage reading shown on the Telulog, from that now shown on the car's own meter.
This item is just the red Telu Log. I have included two pictures of adverts in the listing. These are just for historical context and do not pertain an item as well. Only the Telu Log is being sold.