09-04-2014, 06:36 PM
#1
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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?


Steve

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 09-05-2014, 12:11 PM
#2
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The lines are just the newer design.

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