Ah my mistake, it was this one: https://www.iwc.com/gb/en/watch-collections/portugieser/iw503302-portugieser-perpetual-calendar.html
I think that one was also 44mm.
Back on perpetual calendars, this is 39mm and a really nice size/thickness
@Regal started
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Ah my mistake, it was this one: https://www.iwc.com/gb/en/watch-collections/portugieser/iw503302-portugieser-perpetual-calendar.html