Recently my dear departed uncle left me a topcoat that seems to be a high quality, well-made coat. My aunt thought that he had it made many years ago by an Italian tailor in the Boston area and that it is 100% vicuna. It does have a label inside right that reads 'Elvicuna' and 'Woven from the finest fibers known to man'. My questions: Is this actually 100% vicuna? and What is it worth?