Can anyone help me identify this lamp?

This lamp has varigated glass color in individual glass pieces. Colors are iridescent cream, blue, purple,, green, orange and beads are amber. The tag on the underside (photo #2) reads SPECTRUM. Hardware looks like oil rubbed bronze, 5 lights, canopy is 23 wide at bottom, lamp is 40inches tall. The lovely family I bought it from said it was purchased 20-25 years ago by their parents at an auction in Denver, Colorado. They were told it was 25 years old at the time of the auction. I fell in love with this lamp at an estate sale and plan on putting it in my kitchen. I would love to know a little more about its age ,manufacturer and possible value.
Thank you