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GMTFan · 21 July 2010, 07:07 AM

@Dob: Yes 904L steel is more corrosion resistant (I did not mention this above), but subjectively I also have the impression of it being more scratch resistant - but I am not able to produce figures on th surface hardness. It may be of interest to see that 904L has obviously a higher proportion of alloy metals in it than 316L, according to Wikipedia:

http://en.wikipedia.org/wiki/Steel_grades

Maybe someone wih better knowledge in chemistry than myself will be able to answer this question or post a link.

Some very interesting construction drawings of the GMT-Master II C are posted here:

http://www.rolexforums.com/showthread.php?t=30808

If I read them correctly, the cyclops date magnifier is coated on either side.

Thank you for your compliment!

21 July 2010, 07:07 AM	#11
GMTFan "TRF" Member Join Date: Jun 2010 Real Name: Jann Location: Germany Watch: Rolex GMT II C SS Posts: 15	Reply to your questions / remarks @Dob: Yes 904L steel is more corrosion resistant (I did not mention this above), but subjectively I also have the impression of it being more scratch resistant - but I am not able to produce figures on th surface hardness. It may be of interest to see that 904L has obviously a higher proportion of alloy metals in it than 316L, according to Wikipedia: http://en.wikipedia.org/wiki/Steel_grades Maybe someone wih better knowledge in chemistry than myself will be able to answer this question or post a link. Some very interesting construction drawings of the GMT-Master II C are posted here: http://www.rolexforums.com/showthread.php?t=30808 If I read them correctly, the cyclops date magnifier is coated on either side. Thank you for your compliment!