You'll find the Ray-Ban logo embossed on the exterior of one ear stem, and the inside of one ear stem is marked B&L Ray-Ban, the rear of the nose bridge is impressed B&L Ray-Ban, and one ear pad is marked W2952 PNAS.
Vintage Classic Rayban Sunglasses RB 2140 50[]22 Glossy Black Polarized Wayfarer
Vintage Ray Ban B&L Sidestreet W2347 Bronze Brown Sunglasses 1990s
RARE! VINTAGE B&L RAY BAN W2193 SIDESTREET AVIATOR G15 MATTE BLACK SUNGLASSES
Ray ban Vintage Sunglasses Sidestreet Mondo W2642-OP-AW Sunglasses
Ray-Ban BL Tortoise Wayfarer II Sunglasses Vintage Limited Edition Deluxe USA
Vintage B&L Ray-Ban Round Metal USA G15 w/ Case 1950s BL Glass Rare