A 16550 black "rail" dial, from late 1984 / early 1985, if my memory serves.
And yes, it had a spider dial, but a very subtly one where the cracks could only be seen at some angles, and was virtually impossible to capture in a photograph.

With hindsight, I feel a bit silly I let this one go. The patina really made it stand out. But I remember that I wasn't too fond of the thicker case compared to a reference 16570, and found it a bit cumbersome.
Still, it was a cool watch.