What's it worth? Appraisal of McCaskey record keeping device

Gene asks:

Wally, here is pics on a McCaskey record keeping device.  It was used in an old ‘General Store’ for many years.  When the store closed, I bought it.  What is it worth? 

AW says: This is circa late 1800s. There should be a roll-top on your’s if you don’t have the roll with it, it would be worth about 25% of the values quoted below at most.

Retail value in good condition is $325

Wholesale        $125

Quick sale: $75

Keywords = antique cash register, record keeper, McCaskey, country store register, oak case