The PanoLunar Tourbillon pairs the romantic moonphase-complication with the high-technicality of the tourbillon escapement. The pictured version has a red gold case and a silver dial.Reference 1-93-02-05-05-01 has an alligator strap and a pin buckle.Reference 1-93-02-05-05-04 has an alligator strap and a folding clasp.Reference 1-93-02-05-05-50 has an alligator strap and a short folding clasp.Reference 1-93-02-05-05-02 has a nubuck alligator strap and a pin buckle.Reference 1-93-02-05-05-05 has a nubuck alligator strap and a folding clasp.Reference 1-93-02-05-05-51 has a nubuck alligatorr strap and a short folding clasp.