Vintage 10 Tier BRIO Wooden Abacus Made In Sweden 1960s-70s

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Vintage 10 Tier BRIO Wooden Abacus Made In Sweden 1960s-70s:
$7.50

Please view all photos with zoom as I consider them to be the description.
Abacus shows wear or soiling on its sides and on some of the wooden balls. Also has some red pencil marks on yellow cross bar. See closeup with zoom. Selling cheap, AS IS with NO RETURNS.
Measures about 12 x 11 x 3 1/4 at its base.