Highest possible grade chronometer, adjusted to 6 positions, maximum 21 jewels, maximum 6 Chatons(the Rubies are mounted in screwed gold settings), precision micrometric regulator, Breguet spiral, compensating balance, gold train. There was a higher grade of watch called railroad chronometer, which this watch qualified for.Or Railroad Standard Watches, are specialized. That once were crucial for the safe and correct operation of.
Which relied on highly accurate timekeeping, was used to ensure that two trains could not be on the same stretch of track at the same time. Railroads requirements for a watch in the early 20th century might include. Only American-made watches may be used (depending on availability of spare parts). Only open-faced dials, with the stem at 12 oclock.
Minimum of 17 functional jewels in the movement. Maximum variation of 30 seconds (approximately 4 seconds daily) per weekly check. Watch adjusted to at least five positions: Face up and face down (the positions a watch might commonly take when laid on a flat surface); then crown up, crown pointing left, and crown pointing right (the positions a watch might commonly take in a pocket). Occasionally a sixth position, crown pointing down, would be included.
Adjusted for severe temperature variance and isochronism (variance in spring tension). Indication of time with bold legible.Outer minute division, second dial, heavy hands. Lever used to set the time (no risk of inadvertently setting the watch to an erroneous time, when winding the watch with the stem). Anti-magnetic protection (after the advent of diesel-electric locomotives). 50mm It comes with CERTIFICATE OF AUTHENTICITY. NOTE:PLEASE OBSERVE CAREFULLY THE PHOTOS! IT IS A SIGNIFICANT PART OF THE DESCRIPTION. Every potencial defect which is shown in the photos, but not mention in the description, will be considered for described. All the photos shoot by professional Nikon 105 Macro lens under 40x diopter magnification, so you can explore even the smallest detail like under microscope! Get Supersized Images & Free Image Hosting. Create your brand with Auctiva's. Attention Sellers - Get Templates Image Hosting, Scheduling at Auctiva. The item "Antique Illinois Bunn Special Railroad Masonic/Memento Mori Skull pocket watch" is in sale since Thursday, January 24, 2019. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "riaerica2000" and is located in Sofia. This item can be shipped worldwide.