It's incredible how much better the lume on the SBBN tunas are compared to other SEIKO diver's like the SKX or SNE solar tunas etc. Like, it's gotta be intentional, it's probably 200% brighter and 400% longer lasting. The dials aren't even that different. Sure some of the lume plots on the SBBNs are probably twice the surface area of the SNE499 which would explain the brightness but the actual application doesn't appear to be much thicker or anything like that. Are the SBBN indices hollowed out to allow for more luminous material or something? Is there more Europium and Dysprosium in it, I have no idea. It's literally like the SNE might as well not have lume at all.
I really like the lugs on the 300m tuna, they are rounded and discrete and actually a pretty peculiar profile. Look medieval somehow. Of course the lugless design of the kilometer tuna is even better, but I really don't fancy the sharp and standout lugs on the SNE solar divers. They did it right with the 300's.
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