Dating us patent numbers

Doulton continued, intially, to use the base marks of PINDER BOURNE & CO and/or the initials P. Together with some additional hints that may help with dating your Doulton pottery, porcelain and stoneware. The figurine was therefore produced in 1937 The following numbers indicate the approximate date range or period when the marked item was first introduced.There is an old rule of thumb for dating Doulton figurines; where you add 27 to the small and hardly visable number to the right of the Doulton backstamp. That is not to say that your item was produced in that year but simply that the year indicated is the earliest the piece could have been produced.If something is marked "Patent Pending" you can reasonably assume it was made within a year or two of the patent being issued.Remember that there could have been a year or more between the date of application and the final date of issue.Features like bolt-on necks and pickups wired into the pickguard all helped the Fender factory churn out guitar after guitar, day after day.This also means that various parts used on a particular guitar may have come from different points in time, so no single number can absolutely define when the instrument was built.If you have ever had trouble dating old instruments, this list may be a help.

The most important thing to keep in mind when dating a Fender is the highly modular nature of the designs.Like Henry Ford, part of Leo Fender's genius was in optimizing the company's production efficiency.His guitars were built en masse by an entire factory, not a single luthier toiling over one instrument at a time.Many watch companies made hundreds of thousands of watches, and some companies made millions of watches!It would be impractical to list the individual serial numbers of EVERY watch made... Our serial number tables list RANGES of serial numbers.

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