What you have here is a TTArtisan lens that has a 0.5-metre minimum focusing distance and a 50 mm maximum focal length. The aperture of the lens is minimum ƒ/16 and maximum ƒ/1.4.
From Amazon
TTArtisan 50mm f1.4 Tilt Lens Full Frame Manual Portrait Lenses Large Aperture Compatible with Sony E Mount Mirrorless Camera A7 A7II A7III A7R A7RII A7RIII A7RIV A7S A7SII A7SIII A7C A9
This product is also available at 1 unverified store.