Hallo Herr Kollege
yes i have also PAM 090 with open caseback... but the version with solid caseback is much better... solid, heavy and with saphir glass... the version with open caseback is with mineral glass and cost around $80 (silix) and the version with solid caseback cost around $160 (trusty, josh)... i know why the solid version is more expensive... it is much better... i have saw the solid version by a friend.