#1 Teacher blackboard miniature Inscribed in English #1 Teacher and 1+1=2 . Fronted by an apple, some writing instruments and a sponge. This item was made in the electroforming method. Measurements : Marks : Height: 1.5in. / 3.81cm. Length: 0.5in. / 1.27cm. Width: 1.8in. / 4.572cm. 1 inch = 2.54cm 925 for sterling silver. Weight : Condition : 13gr. / 0.418oz.