Marvin products manufactured after November 2003 feature a laser etched logo and product identifiers. The etching is found on the interior of the glass, in the corner of the window sash or door panel. This etching contains the following information:
CIO-6 05 (Glass manufacturer-Plant Year)
IGCC@CBA IGMAC (IG Glass Certification)
A05256004918 (Serial Number)
NFRC-248 (NFRC Number)
Marvin Windows and Doors (Manufacturing Company)
Examine the silver-colored spacer bar between the panes of insulating glass. The spacer bar runs along the outside perimeter of the glass. If the product was manufactured by Marvin, the spacer bar will bear an engraving that displays the Marvin name, and the last two digits identify the year of manufacture. The engraving may appear at any point around the perimeter of the glass. Some plants between 2000 and 2003 used a clear label at the bottom of the glass, see the sample below.