When did Schatz first add leveling screws to the bases? Most likely, when this feature was introduced, existing stock without leveling screws, painted in various colors, was used up over several months. Which plate(s) first used this base with leveling ? Plate 1283: Plate 1283 was used in 2/53 and 3/53 with a movement containing the compensating spring barrel. These Plate 1283 movements have a date. Are there examples of Plate 1283 as shown in the RG without the date? Are there Plate 1283 movements with other dates? Please post a photo. Comparing plates 1283 and 1287 (and 1014) with earlier plates 1279 and 1281, three extra holes were added (two of which are tapped). Do these holes have a purpose? Plate 1291: Does Plate 1291 (without the RR) have 49 in the circle or 49R in the circle? The production date also includes a month . Please post a photo. The Schatz clock in the photo has Juba signed on the dial. Is there any information about Juba? Thank you for any information about these questions.