Early Simple Microscope by Carl Zeiss, Jena, 1866

Signature on the table "Zeiss Jena 621 929"; this is the 621st simple microscope produced, alongside 929 compound microscopes; original lacquered and blackened brass, screwed onto the box: height 7 ? in., case dimensions 4 ? x 4 ? x 2 ? in., 3 magnifying lenses (15x, 60x and one magnifying lens from Zeiss without magnification specification), coarse and fine adjustment via a drive behind the curved column, swiveling condenser magnifying lens; mechanically and optically in very good condition, with key, box partially lined with velvet. – This microscope type corresponds to the "original model" of Zeiss microscopes. This model established the great success of microscopes in the early years of the workshop in Jena! – A great rarity!

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)