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Yeah as JB said, SLA017. They have done a few other variants in the same case / design, though none with a grey dial.
They do some smaller midrange watches now. The very popular SPB143 is no bigger than the SLA017. In fact I think it’s thinner. About 40mm x 13mm.
Also the SPB313 (and the other dial variants) are about the same size overall as the SLA017 except 2mm thinner (no tall box crystal) and I would say wears similarly in terms of size, weight and lug to lug.
That's lovely. What is the reference please. Normally the Seiko divers are a bit big, not this one.