An interesting responsa on a postcard in the handwriting of Rabbi Chaim Kanievsky.
From the content of the responsa it appears that he was asked a question on the laws of Eiruvin. In his great humility he responded “i read your letter, but am unable to respond to it as I am not currently dealing with the matter”. Alongside the details of the sender of the postcard is the name and address of Rabbi Chaim Kanievsky, apparently in his handwriting.
[1] postcard 15×10 cm.
Very fine condition.