Maker, James Arthur. New York, USA, 1901, serial number 1. Astronomical regulator with unique tri-dial design, Graham deadbeat escapement with Wagner rocking frame, 60-second remontoire, one second compensated pendulum, wheels and frame fabricated from bronze. Arthur made seven of these, this being the first and having a dedication plate in honor of his son Daniel Arthur, dated June 13, 1901. Three are known to survive ¹. Case dimensions 17.5"w x 81"h x 12"d.

All pendulum parts have matching serial numbers.

A close up of the "tin whistle' design of the pendulum compensation.

The serial numbering is carried through to the movement components. The dial rim is the top of the seconds dial. The remontoire is a 60 second cycle and it is interesting to note that the seconds hand exactly match each dial hash mark. This is also followed through for the minute hand that jumps each minute to match exactly each minute hash mark on the dial due to the action of the remontoire. At the top of the hour the the hour hand exactly matches the hour dial hash mark.

1. In addition to this example, one is in a private collection on the East coast of the USA and one example belongs to the great granddaughter of Arthur's other son John Forbes Arthur and two are in the collection of the National Association of Watch and Clock Collectors (NAWCC) Museum in Columbia, PA.