You have most probably seen such notes in the parish books - cause of death and then a number of a death survey card.
Cause of death: Na sešlost věkem dle úmrtního lístku dto 3. června 1873 Nr. 11
(Senility according to the death survey card from June 3, 1873, no. 11.
(Senility according to the death survey card from June 3, 1873, no. 11.
