Well, I have it, it's a lump. I have some pics but until I work out why my phone won't download them there they'll stay. There are no maker's marks on it, but it has two initials and a two digit number in the casting on the underside and 27 stamped into the jaw sections. The acme thread is huge - at least 25mm diameter - but it's very well gummed up atm. The jaws wind in and out opposing each other, next to no wear, though. The four jaws can be set parallel which is useful. The whole thing needs a good soak in Jizer, especially the slides and thread. Greasing should free it up a little, there is a grease nipple for the purpose.