sentences:  In 1980, a Becker-style Stradivari violin copy made by Zygmuntowicz won two gold medals - for violin workmanship and tone - at the Violin Society of America Competition.The same year, Zygmuntowicz began five years of additional training in the restoration workshop of Jacques Français Rare Violins, Inc. and René A. Morel.Isaac Stern owned two Zygmuntowicz violins.