PATENT NUMBERS AND PATENT DATES
Many times you will find an item with an inscribed patent number. This number will reveal to you what time period the piece was manufactured.
|
Patent Numbers 1-7,000 |
Patent Dates 1836 -
1850 |
|
7,000 -
29,000 |
1850 -
1860 |
|
29,000
– 98,000 |
1860 -
1870 |
|
98,000
- 158,000 |
1870 -
1875 |
|
158,000
– 223,000 |
1875 -
1880 |
|
223,000
– 310,000 |
1880
– 1885 |
|
310,000
– 419,000 |
1885
– 1890 |
|
419,000
– 532,000 |
1890
– 1895 |
|
532,000
– 640,000 |
1895
– 1900 |
|
640,000
– 778,000 |
1900
– 1905 |
|
778,000
– 945,000 |
1905 -
1910 |
|
945,000
– 1,123,000 |
1910 -
1915 |
|
1,123,000
– 1,327,000 |
1915
– 1920 |
|
1,327,000
– 1,522,000 |
1920
– 1925 |
|
1,522,000
– 1,986,000 |
1925 -
1935 |
|
1,986,000
– 2,185,000 |
1935
– 1940 |
|
2,185,000
– 2,366,000 |
1940
– 1945 |
|
2,366,000
– 2,493,000 |
1945
– 1950 |
|
2,493,000
– 2,919,000 |
1950
– 1960 |
|
2,919,000
– 3,487,000 |
1960
– 1970 |
|
3,487,000
– 4,181,000 |
1970
– 1980 |
|
4,181,000
– 4, 891,000 |
1980 -
1990 |
*The
information listed above is taken from Costume Jewelry, A Practical Handbook
& Value Guide by Fred Rezazadeh.
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