09-04-2014, 06:36 PM
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I just picked up a (barely) used Model 500 Progress. I notice that the markings between the numbers on the adjustment scale are lines, not dimples. I've seen pictures with both types of inter-number marks on the various Progress models. Any idea if there's any significance to the difference? Is one style newer than the other? If so, which is the current style?


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 09-05-2014, 12:11 PM
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The lines are just the newer design.

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