Dating Small Hazel-Atlas Cobalt Blue Bottle
I've dug up this exact bottle in my back yard, along with fragments of a china plate, broken glass, nails, etc. stuffed inside what appears to be a car muffler or very large squashed can. The only difference from my bottle is that the ejection scar(?) seen in photo #15 is more prominent.
Given HA didn't expand to California until 1929 (source, p24) that's probably our lower bound. If I understand this correctly (p 28), HA started putting date codes in 1957 or so, but the author might have been referring to only mason jars. Thus, I'm guessing a range of 1929-1957. Based on property records I hesitantly suggest an upper bound of October 1952 but that should be taken with a few hundred grains of salt.
Any additional insights would be greatly appreciated, as that'll help me date the other debris.