Antique Kodak Portrait Attachment No. 3 Made in USA w Metal Tin #13 Rochester KY

Metal tin case has worn paint on front, I believe it originally said:
Kodak Portrait Attachment 13 Eastman Kodak Co. Rochester, N.Y. Made in U.S.A. Trade Mark Reg. U.S. Pat. Off.
Inside of tin shows two charts for Focus At / Metres / To Work At

Lens itself shows to be a No. 3 Kodak Portrait Attachment. Excellent condition, no scratches or cracks.

Tags - Camera, Film, Picture, Photography, Accessories, Vintage, Old, Retro, Filter, Zoom, Record, Stillshot, Case,