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19931
Patek Philippe ref. 5205
The 7 variants to date of this Moon Phase Annual Calendar. The last two are still in the current catalog.
Have a nice day!
(Photos credit: multiple websites)
5205G-010 (2010)
5205G-001 (2010)

5205R-001 (2013)
5205R-001 (2013) - Case profile
5205R-001 (2013) - Case back with caliber 324 S QA LU 24H/206
5205R-011 (2022)