Malte openworked tourbillon

Reference: 30067/000P-8953

Movement

Reference: 1790 SQ
Thickness (mm): 6.10
Diameter (mm): 27.37 (12''' ¼ x 12''' ¾)
Number of parts: 246
Energy: manual
Number of jewels: 27
Frequency: 2.5 Hz (18'000 v.p.h.)
Power-reserve (hours): 45 approx.
Indication: hours, minutes, small second, small second on tourbillon, hand-type calendar, tourbillon
Remark: openworked movement