Not sure what camera or other device this was made for. Dynamic Optics 19.3mm F:2.8. Also marked Saeco 18.75X. 25mm diameter, x 25mm high. Clear lens diameter is 10mm on the front and 12mm on the back. The optical assembly is threaded (27mm diameter) and screwed into a 41mm diameter x 18mm deep mounting ring with 7mm wide x 5mm deep vertical groove. Satin black-anodized aluminum casing and mounting ring, multiple elements, coated optics. Unused.
