Perpetual 40-Year Calendar
An instrument used by sailors and navigators. It was so named because, at the time, the average life span was 40-50 years. Instrument consists of 2 brass disks. Align the month on the upper disk with the year on the rim of the lower disk. Now view the calendar of that month in the lower window. Red months apply to leap years.
Specifications:
- 40-Year Calendar
- 1994-2033 in a wooden box
- with original packaging box.
- Made in Taiwan
Excellent pre-owned condition.
Processed within 1 business day (not included in shipping carrier’s estimated arrival time). Tracking is uploaded immediately upon shipment.