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11c, 15c, 16c slip case variations question



#3

Some slip cases for the 10c series of calcs have leather like slip cases with soft, white inner lining and no HP logo stamp on the outer side. Other cases are quite leather like and others are more of a heavy vinyl with HP logos stamp on the outer side.

Is there any rhyme of reason to the variation in these slip cases?

Are some considered more valuable than others?


#4

The vinyl ones with no inner lining or flap came with the calculator.
The ones with the soft inner lining and a flap were sold separately, and came in three colors.


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