. . . "Wristwatches - History of a Century's Development" by Kahlert, Mühe, and Brunner, and opened the book to page 346, upon which there's a photo of a silver dial 1960 Zenith 2000 with the same movement. To quote: 'steel case, 35 mm diameter, 13-line movement, caliber 135, 19 jewels, Incabloc shock resistance, monometallic screw balance with diameter almost that of the movement radius, self-compensating Breguet hairspring, fine regulation via worm gear, Geneva stripes'. Congrats on acquiring this incredibly handsome piece of mechanical art, Mostel . . . cordially, Art