A while ago I wrote a piece on the hundreds of a minute type of stop watches used in management a long time ago, when computers were expensive and efficiency was hoped for from exact measurement of work steps (here: www.watchprosite.com for detail...
It's labeled Minerva Watch Swiss 7 Jewels Unadjusted On the inside of the caseback a serial number 572133 Minerva Watch Swiss and on the ouside, an engraving N.O.C. YMCA #11 And 3-4 Arrowheads too in appropriate places. Mike