Vintage Maurice Damien SP 10 Universal Metal Slide Rule, made in France, with its original fitted case and English instruction leaflet.

This is a French precision calculating instrument from approximately the 1940s–1950s, produced by Maurice Damien of Paris. The all-metal construction features multiple mathematical scales, a sliding center section and a transparent cursor.

The reverse is marked “Photal Process No. 47” and includes a reference table of scientific and engineering conversions.

DETAILS:

• Manufacturer: Maurice Damien, Paris, France
• Model: SP 10 Universal Ruler
• Type: Mechanical logarithmic slide rule
• Approximate period: 1940s–1950s
• Material: Metal / aluminum
• Markings: “Universal Ruler Damien,” “Made in France,” “SP 10” and “Photal Process No. 47”
• Mathematical, logarithmic and trigonometric scales
• Transparent sliding cursor
• Metric and inch ruler markings
• Approximate length: 28 cm / 11 inches

INCLUDED:

• Damien SP 10 metal slide rule
• Original Damien Paris fitted case
• Original English instruction leaflet

CONDITION:

Pre-owned vintage condition. The slide rule shows scratches, marks, discoloration and other signs of age and previous use. The printed scales remain largely legible.

The original case has substantial surface wear, scuffing and deterioration around its edges. The instruction leaflet is fragile and shows folds, tears, splits, yellowed tape and age-related wear.

The instrument has not been professionally tested or checked for calculation accuracy. Please review all photos for its exact condition and the included accessories.

An interesting collectible for slide rule enthusiasts, engineers, mathematicians and collectors of vintage French scientific instruments.

Sold exactly as pictured.