Firstly, all 215-2 movements had a date function.
https://universalgenevepolerouter.com/movements/
Can you post some photos of yours? (movement, dial, and outside of caseback)
Crowns (with tubes) are essentially all interchangeable for polerouters.
However, specific model references came with specific crowns, so despite being all interchangeable they are not all correct.
If you post some photos, and reference/serial numbers, we can chime in on what needs to be done to restore it correctly.
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