Hand viewer Hugo Wijs mark. Stainless steel housing. The lens holder are made of brass and chrome. Made just for slide frames 41x101 mm format. (RBT) Maximum image: 23x33 mm. Production Year 1978 focal point of the lens: 60 mm. Achromat, diameter 23 mm. Individually adjustable sharpness. Fixed interocular distance of 63 mm. Without illumination; Stealing light (STL) Few were made of this model, initially because the design was intended for applications museum / embedded. The first viewer Wijs was made in Holland in 1997 by the company Wijs. It is made of aluminum and has an impressive increase of 8.2 increases and an interocular adjustment allows the user to modify the distance between the focusable lenses. The diffusers were made of glass and the viewer also had a tripod mount. All Wijs viewers had a number of unique engraved number on your body, blue example shown below is the number 60. In the first production of 1997 a total of 50 spectators were manufactured. That race numbers 1 to 5 were gold and the remaining 45 were silver. The second and final production took place in 1999 when 63 spectators in red (29) blue (18) black (12), green (2) and silver (2) occurred. The rarest color is green, of which only have been two. Viewers of Hugo de Wijs are generally accepted by most collectors as the best spectators in the View-Master style ever made and on the rare extremely occasions when it is offered for sale, provided a high price is achieved. Measures Viewer / Glass 3,5x12