Color me dumb, but until I got to the part about their size, I thought it was the other kind of seal, beach ball on the nose kinda seal.
From a around the same era, different location, but prolly used in the same way & there are pictures, Harappa-Mohenjodaro Seals:
http://www.saxakali.com/COLOR_ASP/historymsa.htm
and thanks GoLightly for the link:
History of Mathematics in South Asia
http://www.saxakali.com/COLOR_ASP/historymsa.htm
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