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No – The top surface of the finish is either ground down (most commonly seen on canning/fruit jars but also on screw thread finish liquor flasks, ink bottles, perfume, and other types less frequently) or the side mold seam stops or fades out distinctly below the top of the finish and usually – but not always – below the lowest portion of the finish (i.e., collar) as shown in the Question #1 picture above. (See the *Conditions to Concern #2 box below for several significant exceptions to the side mold seam “rule.”)
We have found a discussion of the most extremely common conditions so you can the medial side shape seam “rule” describing a few version of machine-produced bottles on what the newest vertical side mold seams do not some reach the ideal edge of the end causing them to you can easily appear to be lips-blown.
Ink/footwear gloss package – Various other common difference to that particular relationship concern works together short ink package and you may similar quick, moderately large bore (mouth) bottles such as footwear polish-made within the first 3rd of twentieth millennium
step one. Fire Polishing – Whether or not not often came across, machine-made package may have fire polished end tires – a process and that done away with proof of the fresh shoulder-band mold seam on the rim of one’s package. This type of package won’t have the medial side mold seam continuing from top of the wind up front over and you will on the rim itself. Basically it was done to get rid of the mildew and mold seam rim “bump” which had been sometimes left from the prior to hosts – an activity having helped facilitate most useful sealing that have top caps, screw-bond hats, otherwise similar closures which closed on rim of your own find yourself. These bottles commonly, yet not, feel the straight front side mildew seam moving on as high as ab muscles the top finish front, not on the rim. They will have most other servers-produced qualities just like the discussed to your Host-made Bottles webpage. On experience of this site writer, these server-made bottle are rarely found and probably a function of very early machine-made wares (1905 in order to 1920s) that had faster specific mildew fitted and you may contributed to the desire to own flames refining so you can support correct closing setting.
2. Milk Bottles – Many milk bottles made with press-and-blow machines from the very early 1900s into at least the 1940s resulted in vertical side mold seams that gradually fade out on the neck distinctly below the base of the finish. (Click here for a picture of a typical 1910s to 1940s milk bottle.) This exception to the side mold seam “rule” was caused by the specific workings of these machines which masked the upper portion of the side mold seam. These milk bottles will also virtually always have a diagnostic mold seam horizontally encircling the outside of the finish and a distinct valve/ejection mark on the base. Click on the image to the right to view both mold seam features pointed out on a press-and-blow machine manufactured milk bottle made by the Pacific Coast Glass Company (San Francisco, CA.) between 1924 and 1930. (For more information and images of typical milk bottles from that era, in addition to a description off as to the reasons the side mold seams fade-out toward shoulder, go to the Food Bottles & Canning Jars typology page.)
