Here is a general guideline for Gulbransen-Dickinson Co upright piano serial numbers:
- Serial numbers beginning with "B" were manufactured in the 1880s.
- Serial numbers beginning with "C" were manufactured in the 1890s.
- Serial numbers beginning with "D" were manufactured in the 1900s.
- Serial numbers beginning with "E" were manufactured in the 1910s.
- Serial numbers beginning with "F" were manufactured in the 1920s.
- Serial numbers beginning with "G" were manufactured in the 1930s.
- Serial numbers beginning with "H" were manufactured in the 1940s.
- Serial numbers beginning with "I" were manufactured in the 1950s.
Please note that this is a general guideline only and there may be some exceptions. If you are not sure about the age of your Gulbransen-Dickinson Co upright piano, it is best to contact a piano technician or expert for assistance.