You can read other identification points, like how many teeth on the mandible and the shape of the end of the adobmen. But you need a lens to compare them.
I will post pictures from the first workers. They are very characteristics.
It is a Minolta F1,4 55mm (or 58mm?) lens. And I use it as a closeup lens in reversed position (and open aperture). It is equivalent with about a 8-10 diopter closeup lens. You can read from this technic from Hyperlinks sind nur für registrierte Nutzer sichtbar. He describe it with a compact camera but it works with DSLR-s also.