I have a friend who does metal detecting and collects old bottles he finds from time to time. The other day he asked me to take pictures of some things he has found to get a idea on what they are and possibly worth. If anyone knows... your input is greatly appreciated. Or if you could point me in the right direction... that would be appreciated as well, first bottle has a number 1691 on the bottom. Second bottle he said was made of crock?? third bottle has a deep bottom and a slight deformation on the neck. and the fourth bottles we cant figure out... tops seem to be made of some really soft metalor hardened rubber.