Congratulations on obtaining the personnel record for your gg-grandfather and for you kind words.
IR67 fought in the Seven Weeks War in 1866 against Prussia. IR67 was in the 4th Corps of Austria's Army of the North. It fought at two battles in this war at Schweinschädel and at Königgrätz.
The resolution of the grundbuchblatter image is too low to be able to read it. Could you send it again at a higher resolution?