Two very different watches imo. Both great. If you can find the sbbn045, go for it. Worst case, you hate it, sell it, get an Arnie and have money left over.
The SBBN045. Wrote it off as too much, too big, too thick, too much hands, too much everything. Wouldn't fit my wrist, would be too heavy, would feel like a cheap quartz, ect. Slowly grew in my mind like a parasite, and now it will never leave my collection.
The uncle bracelet for my tuna is great. Like others have said, it's a good option and beats most Seiko or vintage options. It doesn't have anything fancy, but it's solid.
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