Serica 6190. I was offered an Explorer last year and looked down at the Serica 4512 I was wearing and said "Nah, I've got that covered."
6190 is even nicer. Thinner, better movement and those lovely bombe lugs.
I have one and like it more than I thought I would when I acquired it by accident.
It sits at the point of price and quality right before diminishing returns really kicks in. A watch that costs half as much will be obviously less well finished while one that costs twice as much won't be markedly superior.
The blue dial on mine is quite impressive and the hands and indices are genuinely stunning. On the other hand; it wears larger than it's 40mm diameter would indicate, the case is fairly pedestrian in its slab-sided design and the bracelet, while handsome, is a bit meh.
As for the movement, mine is dead accurate and the Silicium PM80 has no plastic parts if that's a worry (it's really not).
I have other watches I like better at that price-point (Serica 4512, Citizen NB1060, Junghans Max Bill) but that's really based on aesthetics not build quality.
I'm not sure it's any more difficult than any other well fitting non-quick change bracelet on a watch without drilled lugs that I have... which is to say it's an utter pain in the ass.
I wasn't a great fan of the fit of the bracelet, even though it's a great looking one, so I've left it on a strap for ages now.
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