weird, the description for the 556ib used to say the exact movement, i.e. ETA 2824. But now it's just
"Movement: Automatic mechanical"
https://www.watchbuys.com/store/pc/Sinn-556-I-B-Blue-Dial-on-Fine-Link-Bracelet-74p3551.htm
on Sinn's website https://www.sinn.de/en/Modell/556_I_B.htm
roundabout way of saying "we're gonna slap whatever movement we have on hand in yer watch"
"Movement: Automatic mechanical"
https://www.watchbuys.com/store/pc/Sinn-556-I-B-Blue-Dial-on-Fine-Link-Bracelet-74p3551.htm
on Sinn's website https://www.sinn.de/en/Modell/556_I_B.htm
The information on the mechanical movement corresponds to the current production situation in Frankfurt am Main. Due to technical changes, it may happen in individual cases that stock items of our sales partners deviate from this information.
In addition to technology, the heart of any SINN watch is the fascinating mechanical movement. We use exclusively the very best quality of movements provided by renowned manufacturers with proven experience with whom we’ve been working for many years:
ETA SA Manufacture Horlogère Suisse, Grenchen, Switzerland
Concepto Watch Factory SA, La Chaux-de-Fonds, Switzerland
Manufacture La Joux-Perret SA, La Chaux-de-Fonds, Switzerland
SELLITA WATCH CO, La Chaux-de-Fonds, Switzerland
Soprod SA, Les Reussilles, Switzerland
Uhren-Werke-Dresden, Germany
The movements are also manufactured in parts in accordance with our technical specifications.
roundabout way of saying "we're gonna slap whatever movement we have on hand in yer watch"

