I agree Norm, my digging partner doesn't seem to think so but I'd bet that today's leave-behind bottles are soon to be tommorow's collectables. i too have saved a lot of the more ornate unembossed bottles that were tooled and a lot of the neater and unusual early screw caps.
it is amazing how much kechup has been consumed ,i my self have found hundreds, but to bad they were all machine made hienz , heres one thats not machine made, it says horton cat d mfg detroit mich any info mike