Minerva was a brand added in 1887 to others operated by the Villeret watchmaking concern in the Bernese Jura, Switzerland. They have gone through various incarnations since being founded in 1858. Watchmaking originally comprised assembling pocket watches using third party movements. They began producing their own movements in 1895. Production expanded to include their own chronographs and stopwatches in 1908 and the company name was changed in 1923 to Fabrique d’horlogerie Minerva, Robert Frères, SA. The Minerva brand had become associated with high quality and accurate time pieces. Acknowledging this, the company again rebranded in 1929, becoming known simply as Minerva SA, Villeret.  Most recently, Minerva SA were acquired by Swiss luxury goods group Richemont in 2006, who partnered the brand with their Montblanc branch.

The Minerva curvimeter model C-01 is an attractive item and feels comfortably robust in the hand. The back of the case has a matt finish while the front is polished stainless steel in to which a scratch resistant sapphire crystal face is set. The face of the dial is white with four concentric scales. The two in black are for measuring scales of 1:100 000 and 1:25 000, the two in red measure 1:50 000 and 1:20 000, with graduations included for each. The manufacturer name and country of origin are shown both on the front face and on the rear of the case. There are two black needles, the larger rotates and measures through the four scales, the smaller scale counts each complete revolution of the larger hand, up to a total of 12 revolutions. Pressing the button on the side of the instrument resets each hand to zero.

The instrument is used by moving the small tracking wheel at the base along lines on a map, or anything else requiring measuring. This in turn acts on precisely machined internal gearing to rotate both needles. Unlike those found on many other map measures, the tracking wheel lacks any fine teeth. It may be thought that the lack of these would mean that the tracking wheel could occasionally skate on a map, but because the action of this analogue instrument is so smooth, the tracking and recording is faultless and there is no discernible internal resistance felt while in use. This measure is amongst the finest map measures ever produced and is extremely accurate.

The measure could be purchased in various formats. The premium offering was a green or blue card box containing the curvimeter in a zippered leather pouch. It could also be purchased with a brown leather slip pouch. More recently, it was sold in a simple two-piece polystyrene box, not styrofoam!

Branding on the polystyrene box includes an arrowhead logo, one of the original brand recognisers from the earliest days of the Villeret watchmaking concern. This arrow brand was registered on 30th July 1887 however the measure itself is much younger than this. I am uncertain when it first appeared on the market but it was certainly being sold in the 1960s, possibly earlier, through to the first decade of the 21st century. It can still be purchased today, but only on the second-hand market.

Overall length of the Minerva Curvimeter is 97.5mm and case and dished face are 12mm thick at the extreme. The metal alloy handle is 47mm in length with a 32mm ridged section to improve grip.