Welcome to the forum, Silje. An authentic Japanese Kyusu should pose little threat of lead contamination. But you can alsways get a lead testing kit ... in the USA anyway, not sure where you are located.
Thanks Adam and Victoria for posting your Kyusu-s. Houjin
, it is a specialized teapot or Kyusu for brewing "cooler tea" such as Gyokuro. This one is pretty old, around 50 years old, or so it was reported to be. It is Bizen
. It is clearly Yohen
... "changed by the fire." It brews Gyokuro magnificently!
Using it today ...