Base Stamps 1974 to 1981
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1974 | //// //// | 1974 saw the introduction of diagonal lines sloping upwards |
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1975 | //// /// | |
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1976 | /// /// | |
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1977 | /// // | |
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1978 | // // | |
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1979 | / // | An error was made in 1979, with the line being removed from the left, instead of the right. There are reports that this was corrected in May of 1979 |
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1980 | / / | Notice the new logo and that BRADFORD PA. Has moved to the bottom centre position |
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1981 | / | |
1974 to 1981 Inserts
The first insert is a continuation of the 1967 insert, which was used until around 1975. This should be single sided as per the first photograph below. There are however a number of minor differences that may be found. (Detail Differences)
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| 1967 insert. Used until 1975 | ||
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| 1976 Insert (Reverse) | 1976 Insert (Front) | 1976 Insert (Front) Type 2 |
Around 1975/76 the insert gained additional text on the reverse as per the photograph above. The two blocks of text on the front of the insert may be transposed
Around 1980 the design of the wick was changed. The newer wick had copper wire intertwined.
