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But any technique, once developed, can be used right up to the present - as many collectors know who have been so unfortunate as to rely too heavily on a popular termination date as sure evidence of true antiquity..." (Toulouse 1969b).
In short, there was (and is) nothing to stop a glassmaker from using an obsolete method in the production of a bottle.3.
They may be able to help determine the model number with the partial number and a physical description.
Check a published serial number list to find the date of manufacture for your Singer sewing machine.
Whether it is a brand new or vintage machine, the Singer brand name will be on the machine.
Using physical, manufacturing related diagnostic features, most utilitarian bottles can usually only be accurately placed within a date range of 10-15 years (i.e., 1870-1880 or 1885) . Like many industries making the leap from manual craftsman production to industrialization and automation, technological advances in bottle manufacturing were not immediately accepted by glass manufacturers or their workers.
Acceptance often occurred over a period of many years or decades in some cases.
With the thousands of styles and designs that were made, it could require some effort to date your Singer sewing machines to the exact year of production.
Still in existence as of 2010, the Singer Sewing Machine Company itself is a useful resource for information about your machines.