The N.V.S.I or Ref. 18-21-XX is the typical pocket watch movement for "normal" pocket watches build between 1905 and 1955. Here are a nice Trio out of the middle of this aera:
THe watch in the middel I want to introduce. On the movement I can read 18-21-1T. The 1 usually stands for the old movement with split bridge and the T for the negative winding (american winding) as it is here. Depending on the movement number it should build around 1936/40. Very amusing is the style of the bridges and I've never seen this before.
Does anyone has any idea why they build it in this way? The watch itself is in a steel case and I can't find any hints that this is different in any way to a usual butter& bread Zenith during this period.
The "nomal" designs (old and new) is in this way:
on the right side is one out of Basacon where they obviously don't change their bridge design to a closed bridge.
KInd regards Silke and I hope you enjoy this simple but good quality pocket watches