Ferraz is not a producer of Madeira that I have seen. Michael Broadbent, who probably has tasted more old Madeira than anyone, does not describe a Ferez 1900 Madeira of any kind in his 3 wine books published over the last 20+ years. He also makes this interesting statement in his first book:
"I think I ought to mention at this stage that many bottles of old madeira found in the cellars of country houses are rarely of the quality of the true vintage and old solera wines that emanate from the island itself. I well remember coming across an enormous stock, all about a century old and all (after random sampling) thin and acetic, dead and gone."
Thus I would not get my hopes up too much unless more information can be found about the reputation of Ferraz.
In general, the year 1900 was an outstanding one and especially for Sercil and Verdelho Madeira. A 1900 is fairly young as far as Madeira goes. Bottles from even the late 1700s sometimes come up for auction. A true vintage Madeira with a year should not be confused with a solera Madeira with the mention of a year. A solera wine is a mixture of perhaps many quite younger years with often only a small part of the wine coming from the year mentioned.
I collect vintage Madeira, and have bottles going back to 1827. The only
1900 I have is the Vintage Moscatel from d'Oliviera which Broadbent rated 4 out of 5 star. I would only buy these wines when I could read good tasting notes written by Michael Broadbent and a few others who tasted many old Madeiras, mainly in connection with their work at wine auction houses. I would say the next thing you need to do is to search to see if you can find out anything about Ferraz and the 1900 bottle you have. With only a single bottle, unless there is a good review of the wine somewhere or the firm of Ferraz had a very good reputaton, an auction house or knowledgeable buyer is not likely to pay very much for the wine for reasons explained in the Broadbent quote given.
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