Pentax SMC Pentax-M f/1.7 50mm Standard Lens Prime w/ Front Cap | eBay
50mm F1.7 Large Aperture Camera Lens Manual Focus Prime Lens Pk Mount Replacement For Pentax K1/ K-1 Mark Ii Full Frame Cameras - Camera Lenses - AliExpress
Pentax-m SMC 50mm F/1.7 Lens PK Mount With Cap-for Pentax Film - Etsy Hong Kong
Amazon.com : Pentax Front Lens Cap 49 mm (Y) for Da 50-200 mm WR, D-FA 100 mm Macro WR : Camera Lens Caps : Electronics