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How to determine magnification?


Rolexman

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If the gen is 2.5, I'd say it's 2.3 maybe- it's pretty close.

And frankly, I don't think Rolex really cares about it too much.

My gen 16800 came from Rolex service w/ a new DW and the mag was puny. Then I put in a NOS DW and all my problems were solved!

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To be able to make any kind of accurate comparison, the lens under scrutiny must be the same (correct) distance from the datewheel. Otherwise, the magnification will be artificially increased (or decreased). For what it is worth, I would be very surprised to see Mr. Slimeball selling lenses with the correct 2.5x magnification.

And I must disagree with Alli in that Rolex (& most who are familiar with Rolex specs) will be able to ID an improper cyclops mag when viewed from an arm's length away. I have also purchased gen Rolexes from long-time Rolex dealers that came with either the wrong gen xtal or an aftermarket xtal, resulting in weak date magnification &/or slightly off-center date positioning (both of which are remedied with the (correct) gen xtal). GMTs, DJs & DDs are especially apt to have been fit with the wrong gen xtal due to the number of xtals that physically fit the case, but, due to varying versions within a model range (each having a different movement), leave the date window slightly off-center.

My Mystery DJ, purchased years ago from a well-known collector/dealer, had been fit (by the dealer) with a xtal that was made for a later DJ version & T116s are frequently (& incorrectly) cited by knowledgeable dealers as the correct xtal for 6542 GMTs (the T115, which differs only in the location of its cyclops, is the correct part).

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