Vintage Handmade Hardwood Chinese Abacus - 11 Rods 77 brads Brass corners

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I had this in my collection of stuff for 50 + years and it was used when I got it.
So,
I do not know how old it is but much older
than
50.  It has been in a
smoke
free home all this time.
It looked great with my antique computer
collection
.
It is in great condition and works just like it should.
It is 8 1/2" x 5".   No need to update the software on these calculators.  :)