What do the numbers inside my frame mean?

The first group of letters and numbers inside the temple arm is the manufacturer’s model number. Further down the arm come the dimensions in millimeters with eye size, bridge width, and temple length. On most frames, there is also a color name or code afterwards.

EC455 53-17-140 020

EC455: Brand abbreviation and model number

53: Eye size/Lens width

17: Bridge width

140: Temple length

020: Color code

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