Solera process

edited December 1969 in Madeira Wine
I have an 1827 Quinta do Serrado Bual - I am aware of its value and am looking forward to an appropriate occasion to pop it - my question is: was the wine made by the Solera process? When was it likely bottled? If other vintages are added (solera), what proportion of the 1827 vintage is it likely to contain?
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