| Parameter | Miyota 9015 | ETA 2824-2 | |-----------|-------------|-------------| | Height | 3.9 mm | 4.6 mm | | Winding | Uni-directional | Bi-directional (efficient) | | Power reserve | ~42h | ~38h | | Beat rate | 28,800 | 28,800 | | Hacking | Yes | Yes | | Hand-winding | Yes | Yes | | Price (new) | ~$70–100 | ~$200–300 | | Service cost | Lower | Moderate | | “130” marking | No | Possible (factory code) |
However, a JuFeco 130 project existed and was known to have been proposed for production by the German aircraft engineer company, the German engineer and businessman, Hermann Schulte the chairman, JuFeco's chairman of the executive board, a German engineer. This was during the 1930s when the world was witnessing the rise of military aircraft development across various nations. In this review, we will focus on this specific aircraft project, which offers a unique insight into the evolution of Luftwaffe aircraft design during this tumultuous era.
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Whether Miyota 9015 or ETA 2824-2, both are . The “130” remains mysterious — likely a case or factory code, not a movement feature. For deep understanding: study the 9015’s winding efficiency limitations and the 2824’s bidirectional ball-bearing rotor system.
For this piece, I will treat for a high-beat, automatic, thin movement (3.9mm thick). The most likely candidate is the Miyota 9015 , often praised as the “Japanese ETA 2824.” | Parameter | Miyota 9015 | ETA 2824-2
Thus: , then the deep piece would pivot to that movement.
❌ — less efficient than bidirectional (e.g., ETA 2824). Rotor must be heavy, which can cause “rotor wobble” if bearings wear. ❌ Rotor noise — still audible in quiet environments, though improved over 8215. ❌ No seconds stop when crown pulled — some examples have slight hand backlash. ❌ Regulation — no fine-regulation screw (uses a lever + eccentric screw), so adjusting beat error requires skill. Rotor must be heavy
Although specific details of the JuFeco 130 were mostly unknown, one can speculate about the aircraft's configuration based on the general trend of German aircraft from that era.