--- title: "Martens Doetinchem Promotional Cast Aluminum Clock | Curiosa.com" description: "A wall clock fashioned from a cast aluminum insignia plate for Martens Doetinchem, a Dutch transport and logistical company. The object features a pebbled re..." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Product", "name": "Martens Doetinchem Promotional Cast Aluminum Clock", "description": "A wall clock fashioned from a cast aluminum insignia plate for Martens Doetinchem, a Dutch transport and logistical company. The object features a pebbled red enameled background with raised polished aluminum lettering and a lion rampant heraldic shield. The clock face is fitted with a battery-operated quartz movement by Nufa, accessible via the reverse. 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The object features a pebbled red enameled background with raised polished aluminum lettering and a lion rampant heraldic shield. The clock face is fitted with a battery-operated quartz movement by Nufa, accessible via the reverse. Three mounting holes are positioned at the 12, 3, and 9 o'clock points, suggesting this plate was originally designed as a truck radiator badge or commemorative plaques before being converted into a timepiece. Compare with other mechanical pieces in the archive: [Bang & Olufsen BeoLab 8000 Loudspeaker](https://curiosa.com/archive/mechanical/bang-olufsen-beolab-18-loudspeaker), [Forestville - Tambour Mantel Clock (c.1945-1955) Bim-Bam 8-Day Movement](https://curiosa.com/archive/mechanical/forestville-tambour-mantel-clock), [Mid-Century Compass Saw (Keyhole Saw) with Molded Bakelite or Resin Handle](https://curiosa.com/archive/mechanical/small-hand-saw-keyhole-saw-or-sabre-saw). ## CROSS-CULTURAL PARALLELS ### Where This Object Echoes Dutch Industrial Design 1960-1985 The use of bold, sans-serif typography on pebbled enamel echoes 20th-century Dutch transit signage and heavy machinery plates. ### Ritual & Ceremonial Use - • Corporate gifting for long-service anniversaries (jubileum), a common practice in Northern European industrial firms. ### Meaning Through Time 1970s Symbol of corporate regional dominance and logistical reliability. Modern Automobilia/Trucking collectible representing 'vintage' Dutch transport history. ## SCARCITY Uncommon 70-80% Common Legendary Genuine antiques with fewer examples on the market. Named makers, documented provenance, or early production examples. Rarity 5/10. Curiosa currently catalogues 1 mechanical item at rarity 5 or higher. ### Typical Characteristics - Limited production - Named makers - Growing collector demand ### AUTHENTICITY CONFIDENCE Very High (85% confidence) #### Confidence Factors - Presence of original Nufa movement consistent with Dutch industrial production of the era - Standard industrial casting techniques visible in the aluminum mold marks [How does authenticity detection work?](/fake-art-detection) ## ENGINEERING APPRAISER'S TAKE Decorative Arts Specialist Silver & Glass Expert Highest confidence based on the clearly legible company name, geographic location, and identifiable Dutch clockwork manufacturer markings. ### KEY EVIDENCE - 1 Nufa movement labeled 'nedklok holland' confirms postwar Dutch manufacturing. - 2 Company name 'Martens Doetinchem' identifies the specific logistical firm from Gelderland. - 3 Integrated mounting holes suggest dual-purpose use as a badge or wall plaque. - 4 The red hobnail texture is characteristic of mid-century baked enamel processes. ### UNCERTAINTIES - • Battery terminal corrosion is common in un-serviced quartz movements from this era. ### WHAT WOULD IMPROVE CERTAINTY - → Insert a fresh C or AA battery to check movement sweep and timing precision. - → Clean aluminum with a non-abrasive metal polish to remove surface oxidation on the rim. COLLECTOR GLOSSARY (3 terms) ## CONDITION & GRADE Very Fine ### Grading breakdown Enamel retention is approximately 98% with no visible structural cracks in the aluminum casting. ### Condition The red enamel shows minor surface grime but no significant chipping. The black hour and minute hands show slight paint thinning at the tips, and the battery compartment terminals require inspection for oxidation. ## INDUSTRIAL ARTIFACT VALUE $45 - $120 Updated: May 11, 2026 How we estimate value ### Who buys this Dutch regional historians, automobilia collectors specializing in trucking (Vrachtwagen), and enthusiasts of mid-century industrial design. ### What increases value - • Operational status of the Nufa movement - • Condition of the red enamel recessed field - • Regional demand within the Gelderland province of the Netherlands ### What lowers value - • Missing or replaced hands - • Internal movement failure requiring specialized quartz replacement - • Deep scratches to the polished aluminum lettering ### What makes top-tier examples - • Perfect enamel with no 'crazing' or heat-related discoloration - • Original box or corporate presentation documentation ### Grade & condition Surface oxidation level, enamel integrity, and timekeeping accuracy. ### Rarity & demand Uncommon Moderate demand Moderate liquidity [Browse similar mechanical objects](/archive/mechanical) For informational purposes only, not a formal appraisal. ## FROM THE CABINET OF [RE ](/cabinet/rene) [ ### Rene ](/cabinet/rene) Fellow Collector • 44 items [View Full Cabinet](/cabinet/rene) ### COMMENTS No comments yet. 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