Ladies Rubaiyat wrist watch which was also wearable as a pendant. Case serial number is extremely low (1000099).
The RUBAIYAT W Co. stamping looks different from other examples, its crude compared to other examples. Note also the placement of the "R" in Rubaiyat (almost off the edge of the bridge).
The movement is dual stamped A.HAMMERLY who was responsible for some of the first date complication movements in 1915 and registered some of the first patents for such movements.
Somethng to also note with this watch is the sub-second hand dispay, something very rarely seen on a ladies watch of this era.
I've been looking at a number of very early adverts of late for 1916 to 1920. These adverts show many other watch manufactures and the varioius case, dials, numbers and hand designs used during this period.
I found a number of 1917 adverts that matched the case crown guard, numbers and hands, so this example maybe as early as 1917. We know Bulova first used the name Rubaiyat in 1916.
This watch has me re-thinking how these early watches are dated.
After a full dissassemble and thorough clean and polish, she's working beautifully with a strong heart and keeping great time.