Rare Microscope by Carl Kellner from Wetzlar, 1854

Marked "C. Kellner in Wetzlar N. 128", original lacquered brass with black iron base, height 13 in., 2 eyepieces, 3 objectives, coarse adjustment via tube, fine adjustment at the rear under the column, pinhole aperture disc under the table, microscope and all parts are completely original and in excellent condition! Mechanically and optically very good, walnut case. – Between 1851 and his untimely death in 1855, Carl Kellner produced only about 165 microscopes bearing his signature. The company was initially continued by his employee Friedrich Belthle. In 1865, Ernst Leitz became a partner and took over the business completely in 1869. Kellner's Optical Institute and Workshop is considered the nucleus of the Leitz company.

布雷克拍品等级是为了方便竞买人判断拍卖品的成色而设置的。布雷克等级用1到6级来标注外观和功能的成色，(从非常好到非常差)。 在目录图册里用括号里的2个数字来表示，前一个数字表示外观成色的级别，后一个数字表示功能成色的级别。如(3/2)表示外观成色是3(满意的)，功能成色2(好)。 成色 定义参照下列标准： 1 - 非常好 (未使用过，没有使用痕迹) 2 - 好 (新，极少的使用痕迹) 3 - 满意的 (普通的使用痕迹) 4 - 及格的 (明显的使用痕迹，某个非主要部件是后配的) 5 - 有缺陷的 (极明显的使用痕迹, 某个主要部件是后配的，功能上有缺陷，需要修理) 6 - 非常差 (严重破损, 缺少重要部件)