Emmi - my sincere thanks as always for your invaluable help , and apologies for being a little late in responding. It is indeed a heavy piece and a very deep and rich beautiful colour.
In response to rosie's comments, I am quoting from Leslie Jackson's book - almost verbatim - re the authors explanation of the colour amber, and taken from the glossary. I have omitted those comments referring to page Nos. and illustrations in the book - since if people don't have this volume, then these comments will mean nothing. If the mods feel that the following is unethical or inappropriate to be included here, then by all means remove the paragraph, and I shall more than understand
""Initially an olive-brown lead glass colour produced during the last quarter of the nineteenth Century and the early twentieth Centre, used for both table glass and ornamental glass. Later, a brighter, more orangery, selenium-based amber was produced from the 1920's until 1962. The earlier amber was considerably darker than the later amber, and some comtemporary records, such as the accessions Register for the Ancoats art museum of 1899, actually referred to it as 'brown'. Some ornamental pieces dating from the 1880's-1890's were made of heat-sensitive two-tone amber/ruby glass. A 'pale amber' is recorded in the Order Book 1899-1900 in the entries for Siegfried Bing of Paris, the first documented use of this colour being at an arts and crafts exhibition in Manchester in 1895. Amber was also occasionally used for decorative purposes, such as melted in threads, for during the early 1900's. The new amber developed by Harry Powell in 1903 was first shown at the arts and crafts exhibition of 1906, where it was described in a contemporary review as 'of a pure golden tint coloured with oxide of selenium'. After the first world war gold amber, as it came to be known, became a standard colour, although from the 1949 catalogue until 1962 when it was discontinued, it was known as golden amber. In 1969 a new selenium-based bright orange soda glass called tangerine was developed. In 1978, a 'bright golden amber' was re-introduced for the New 'Studio' Range.""
You can see how complex this colour issue became, way beyond me, but included for those who may find it interesting.
Reference: Whitefriars Glass - The Art of James Powell & Sons - Edited by Leslie Jackson - 1996 - 1997.