|Size - diameter excluding winding crown:||20mm|
|Size - length including lugs:||48mm|
Pristine and rare Gruen Curvex wristwatch with 48mm X 20mm size and 14K gold-filled Gents. Circa 1940’s. The curve of the watch is just perfect and fits on any wrist. A joy of precision and beauty.
Beautiful style with length with 48 mm lug-to-lug and width 20mm without a crown and the thickness is 8mm.
The case is in 14K yellow gold-filled, No. 3087068 with PEND TPAT 5-3-27. The shape of the case is rectangular and features oversized/curved lugs and a snap back.
Gold dial displays Arabic numerals, minute/5-minute tracks, baton hands, and subsidiary seconds.
Classic Calibre 311 with movement number 340223. 17 jewels manual movement with lever escapement, is stem-set, and is signed. Conoruma hairspring and balance (Conoruma is Gruen's proprietary alloy used for balance wheels and hairsprings. The Hamilton Watch Company used a famous, similar material called 'Elinvar.'
These alloys are designed to be stable in spite of temperature changes—they will expand or contract very little when the watch gets warm or cool. Because a watch is so delicate, changes in temperature will otherwise cause the watch to run slightly fast or slow.
Balance and hairspring alloys like Conoruma help combat this problem). Three letters also on the movement GXC.
In 1879, Dietrich Gruen, a watchmaker living in Columbus, OH founded a Co named Gruen & Savage. At the turn of the 20th century, Gruen only used Swiss movement even though the production of the case and finishing were done in the US. Gruen made is own manual caliber called “Very thin”. In 1908, Gruen introduced watches for women’s and then a solid gold movement to celebrate its 50th anniversary. In the 1930’s, Gruen and Rolex used the same caliber in the “Duo-dial” and the “Prince”.
The mythical curvex model was introduced in 1935 and then the “Curvametric” in 1948 and “Autowind” in 1958.
Gruen Curvex with Calibre 311, 17 jewels and Conoruma hairspring and balance. Case in 14K gold filled with number 3087068. Arabic numeral 1 to 12 except 6 and minute/5 minute tracks, baton hands and subsidiary second.
Diameter excluding winding crown: 20mm
Length including lugs: 48mm