Vetri Murano (VM) Glass Labels Guide
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Below is a list of numerical codes found on the Vetri Murano labels, along with the corresponding Murano factories that they relate to. They came with either a clear transparent or opaque white background, with the words "Vetri Murano" and logo "VM" in black writing. These labels have been in use since the early 1980's (found on signed and dated pieces), and possibly up until 2001. The Vetri Murano labels are thought to be a method of protection and certification for authentic Murano glass factories, that pre-dates the Vetro Artistico Murano (VAM) trademarked labels which came into use since 2002. The information below comes from labelled examples found online or shared by members of two Murano glass study groups based on Facebook.
Sources:
Label Examples:

Vetri Murano label with white background and "040" code. Also available in transparent. Used from approx 1980's - 2001.
Click or tap on an entry below to see a drop down with more information, and examples if available. Some of the examples may be member posts in the above mentioned Facebook groups. To view those posts, join the relevant groups.
Key:
- = Examples with opaque label
- = Examples with transparent label
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