You know what chrono24 has good filters, so that might be a good place to start to ID what options there are.
For eg I did a quick search and this Mont Blanc came up. https://www.chrono24.co.uk/montblanc/heritage-spirit-perpetual-calendar-mens-watch-110715--id20556369.htm
The problem I think you'll run into is size. Citizen have loads, but there all like 44mm. https://www.hsamuel.co.uk/webstore/d/5276438/Citizen+Eco-Drive+Perpetual+Calendar+Men%27s+Bracelet+Watch/
@hugo7 started
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You know what chrono24 has good filters, so that might be a good place to start to ID what options there are.
For eg I did a quick search and this Mont Blanc came up.
https://www.chrono24.co.uk/montblanc/heritage-spirit-perpetual-calendar-mens-watch-110715--id20556369.htm
The problem I think you'll run into is size. Citizen have loads, but there all like 44mm. https://www.hsamuel.co.uk/webstore/d/5276438/Citizen+Eco-Drive+Perpetual+Calendar+Men%27s+Bracelet+Watch/