====== Eterna 1413 ======
[[Eterna]] **Cal. 1413** was one of a family of [[automatic]] watch movements produced from [[1953]] to [[1958]].

===== Overview =====
[[ETA]] was one of the three firms "chosen" to develop advanced [[automatic]] watch movements by [[Ebauches SA]], thanks in part to their history with [[Eterna]]. The chief designer at ETA, [[Heinrich Stamm]], had created many of the company's important watch movements, and was famous for the [[Eterna-Matic]] line of watches.

Cal. 1413 was the the successor to Eterna's first full-size [[ball bearing]] [[automatic]] movement, [[Eterna 1247|Cal. 1247]]. This five-ball design became the logo of the [[Eterna]] watch company.

===== Technical Details =====
Once the ball bearing rotor was proven, Eterna began working to make the movements thinner. This family is reduced in thickness from 5.9 mm to 5.55 mm for non-date versions and 5.85 mm for date. Most models have 17 jewels, though later versions have a 21 jewel option. All operate at 18,000 A/h and have 48 hours of power reserve.

This movement family includes 11.5 [[ligne]], 12.5 ligne, 13 ligne, and 13.5 ligne variants.

===== Variants =====
Cal. 1413 one of a family of automatic movements.

All movements use suffix "U" to signify Eterna-U shock protection. Suffix "D" denotes a new 3-spoke ring balance, new hairspring stud, and new hour wheel spring.

  * Eterna 1411 - 11.5 ligne, domed dial
    * Eterna 1421 - date
  * Eterna 1412 - 12.5 ligne, domed dial
    * Eterna 1422 - date
  * Eterna 1413 - 12.5 ligne, flat dial
    * Eterna 1423 - date
  * Eterna 1414 - 13 ligne, domed dial
    * Eterna 1424 - date
  * Eterna 1415 - 13 ligne, flat dial
    * Eterna 1425 - date
  * Eterna 1416 - 13.5 ligne, domed dial
    * Eterna 1426 - date

===== See Also =====
  * [[Eterna-Matic]]
  * [[Eterna 1247]], the predecessor movement
  * [[Eterna 1438]], the successor movement


{{tag>Movements Eterna_calibres Automatic_movements}}