Vintage Wayfarers may not offer any UV protection so be very cautious about wearing them on bright sunlight days.. I have a couple of old pairs like this and all they have are Polarised lenses; basically the same process that you would find on a camera lens filter. They have no UV protection and what makes that a possible issue is that your eyes have the shade without the protection, the pupils dilate with the glasses on and the sun can burn your corneas in the process. I only wear my vintage Wayfarers on overcast days if I want to enjoy them, yet one doesn't need sunglasses on overcast days and only to pose in while seated in an outdoor cafe.
Modern plastic composition and processes will be different from that of decades ago.
On my vintage Wayfarers the plastic is black and the frames are somewhat thicker; bulkier and certainly heavier than modern ones.
Vintage Wayfarers may have the following markings:
- (Inside Left) WAYFARER (Inside Right) B&L RAY-BAN U.S.A. (B&L marking stands for 'Bausch & Lomb')
Side View: the top of the frames are leadning forward prominently while the lower rims sweep back to rest on the cheek.
Nose bridge is molded right into the frames and are not adjustable.
Arm hinges have no back-spring and cannot bend outward.
Hinges that join the side arms to the rims have decorative but plain elliptical studs, both front and sides (WAYFARER)
Lense glass will be of real untempered glass (dangerous of a rock ever hit them while on your face).
Side arms are wide and flat and taper toward the back. There is a ridge that coomodates the ear.
A common issue wth that vintage was they either fit perfectly or were too tight or too large but seldom perfect fit.
On a hot day, with perspiration on the nose, it was common for the heavy things to drop off your head, and I mean fast!.
If you swung your head or jerked it left or right bruptly, they were prone to flying right off your head with efficient lightning speed..
This would be of serious concern while driving a car or performing any other dangerous task.
There used to be an optional strap one could by to stop the glasses from flying off the head.
There were 2 models of strap:
1) wide elastic cloth strap that attached to the side arms and snugly fit around the head. literally holding them on..
2) elastic-type rope that attached to side arms but hung loose behing the neck, serving only as a safety catch if they flew off your melon.
Summarily, the old Wayfarers were a good looking but unsafe product, though still great to strike a pose in.
The 'WAYFARER II' model has 'scripted 'Ray Ban' studson the sides of the arms.
The frames don't jut forward quite as much as the original Wayfarer model.
Both WAYFARER and WAYFARER II models came in Mens and Womens models and in sizes for children and adults.
I am now realising that the pair that jut forward are womens and the ones that are more flat are the mens.
This makes sense because the ones that jut forward do have a more feminine effect while on my head.
Hope this helps.