I did a little digging earlier this week, 3 bottles, 3 different locations, all along the riverbank or very near it. The aqua bottle I'm guessing is at least 100 years old and reads "American Dressing Boston & Montreal. The 2 milk bottles (Royal Dairy and Silverwood's) are from the 1930s and those Royal quarter pints are hard to find, at least in my experience. All 3 bottles cleaned up very nicely and are in good condition.
The rusty piece of steel is definitely a masonry hanger and I thought it might be for a LRI, it was found near the Boston & Montreal bottle.