This is a very nice zoom lens made by Tamron from their Adaptall-2 line of lenses. This means that this lens can be adapted to almost every MF camera system ever made using the respective Adaptall-2 adapter.
This lens has a very nice macro feature I have never seen in any other lens. The minimum focusing distance of this lens is 0.25 metres which is only available at the long end (70 mm). The max. magnification is 1:2.8 which is very useful. At 35 mm the minimum focusing distance is 0.90 m. If you try to focus closer than 0.90 m at the wide end, the zoom ring starts turning and you can bring the lens all the way to the long end (70 mm) by simply focusing to the closest distance of 0.25 m. Please see below for more details about the features of this lens. The macro capabilities of this lens are very usable.