So many of those early gloss dials age badly, whether they're Sub Dates, or SDs, or even the late 5513s. You can get weird mottling, spidering, uneven matte spots, etc .... I wouldn't assume it's water damage, unless there's other evidence, e.g. in the movement.
Regardless, I'd still pass. Damage is damage. It's a shame because that tritium does indeed have nice patina.
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