The line you see on the edge of the base is a groove made during the throwing process. It is not a crack which will develop further or crumble. 
Shigaraki Irabo teapot by Onishi Satoki #10
Inside the pot is not glazed.
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Hand-crafted by Onishi Satoki in Shigaraki, Shiga-pref, Japan
Comes in a signed wooden box.
Comes in a signed wooden box.
Approx. size: length (body + handle) 8.7 cm / 3.4", height 5.3 cm / 2",
Approx. full vol. 80 ml / 2.7 oz
Approx. full vol. 80 ml / 2.7 oz
US$175.00 (Shipping charges not included)