Antique Wed. J. Ahrend & Zoon Surveying Set – Pantometer No. 7305 & Optical Square – Original Case – c. 1900–1910 An early 20th-century surveying set by Wed. J. Ahrend & Zoon (Amsterdam), comprising an original Pantometer No. 7305, a matching double right-angle prism (optical square), its original metal storage case, and the original fitted wooden transport box. Dating to circa 1900–1910, this professional surveying outfit was used for land measurement, engineering and cadastral work. Complete examples are becoming increasingly difficult to find. The set includes: Ahrend Pantometer No. 7305 with engraved serial number Precision 360° graduated scale Original mounting stem with brass adjustment Double right-angle prism (optical square) Original metal prism container Original fitted wooden transport case Historical Context Wed. J. Ahrend & Zoon was one of the Netherlands' leading suppliers of professional surveying and scientific instruments. Their precision equipment was widely used by engineers, surveyors and government services throughout the early 20th century. Specifications Maker: Wed. J. Ahrend & Zoon, Amsterdam Date: approx. 1900–1910 Approx. dimensions case: h 10 × w 10.5 × d 19.5 cm Approx. total weight: 2.0 kg Condition In excellent antique condition with attractive age-related patina and normal traces of professional use. The pantometer rotates smoothly, the engraved scale remains crisp and legible, the prism is intact, and the original wooden case is complete with functioning hinges and closures. Please study the photographs carefully, as they form an integral part of the description. A rare and desirable Dutch surveying instrument set for collectors of scientific, engineering and geodetic instruments.