MMD和MD的 区别

请教各位老大，maxi marine drive 和marine drive 区别只是在外表尺寸上吗，还是机心也有区别。
拜谢！

Yes, the difference is to do with the size, Maxi Marine Diver is 42.7 mm, and Marine Diver is 40 mm.

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机芯是一样的，除了尺寸不同，MD没有表冠护肩

无意中看到另外一个区别，虽然都是UN-26机芯，但是MD是48小时动力，MMD只有42小时
Marine Diver
The officially certified selfwinding movement (C.O.S.C) features a power reserve indicator and an oversized small seconds register. The 40 mm case is fitted with a unidirectional rotating bezel with a diving scale. The model is water resistant to 300 meters. Screw down security crown. Ref. Nr. 263-51-7
Diameter 40 mm
Case Stainless steel
Dial Silverized dial
Movement UN-26
Power-reserve Approx. 48 hours
Winding Self-winding
Water-resistant 300 meters
Crystal Sapphire crystal
Bracelet Steel bracelet
Buckle type Expandable clasp


Maxi Marine Diver
Officially certified chronometer movement. Power reserve indicator. Oversized seconds-hand. Screw down security crown. Unidirectional turning bezel.

Ref. Nr. 263-33-7/95
Diameter 42.7 mm
Case Stainless steel
Dial Burgundy dial
Movement UN-26
Power-reserve Approx. 42 hours
Winding Self-winding
Water-resistant 300 meters
Crystal Sapphire crystal
Strap Stainless steel bracelet
Buckle type Deployant clasp

尺寸的区别 大概还有发条的改进吧 不过48小时和42小时 又能有什么区别呢

多了6小时，待机时间达到两天整了哦^_^，不会是UN笔误吧
感谢大家慷慨解答