Drop-in resolution
Miyota 8245 vs Miyota 9011: do they swap?
Whether the Miyota 8245 and Miyota 9011 share a case, and what changes if you move between them.
Close in diameter, not a drop-in. The Miyota 8245 (26.00 mm x 5.67 mm) and Miyota 9011 (26.00 mm x 3.90 mm) are near in size but differ in height, dial feet or layout, so moving between them means a new dial, hands and often a case adjustment.
The Miyota 8245 is the fullest-calendar 8200 member, with day, date and a 24-hour indicator. The Miyota 9011 is a 90-series premium automatic with a 24-hour sub-hand and no date.
They differ in height (5.67 mm vs 3.90 mm), beat rate (21,600 A/h (3 Hz) vs 28,800 A/h (4 Hz)), calendar layout (centre seconds, day and date at 3, 24h sub-hand vs centre seconds, no date, 24h sub-hand), winding behaviour. An 8200-family caliber at 26.00 mm x 5.67 mm carrying day, date and a 24-hour sub-hand. It shares the family footprint with the 8205 and 8215 but needs a dial printed for its added complications.
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.