Drop-in resolution
Donor movement for the Sellita SW215-1
Which movement drops into a Sellita SW215-1 case, and what has to match beyond the footprint.
Drop-in available. The ETA 2804-2 shares the Sellita SW215-1 footprint (25.60 mm x 3.35 mm, centre seconds, date at 3) and is the standard donor.
The Sellita SW215-1 sits in the 11 1/2 ligne hand-wound, date at 3 (25.60 mm x 3.35 mm) group. The ETA 2804-2 share its casing diameter, height and calendar layout, so a case and dial built for the Sellita SW215-1 accept them with the correct dial and hands.
Matching diameter and height is necessary but not sufficient. A donor is only a true drop-in when the dial-foot positions, hand-hole sizes, stem length and calendar layout also match. Two movements can share a case and still need a new dial, re-broached hands or a cut-to-length stem.