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No GS with the 30 mm 9R65/9R15 is less than 39 mm in diameter. Yet the SLGB001/003 with a 30 mm 9RB2 achieves 37 mm.
How did they do that?
A Japanese-language article in webchronos.net offers an answer:
1) 9R6 required an anti-magnetic casing ring as it (specially, the glide wheel) is susceptible to magnetic interference. Cal. 9RB2 integrates the anti-magnetic components within the movement itself. I think this…
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