I've seen a few threads asking about these and what they are etc. I did a little looking around and found them. Go to (ooopppsss!) and you'll find them for sale on there.
They're Anabol (D-bol) Methandienone by British Dispensary Company Ltd and are 5mg tabs. I found the site, but it's a source, so couldn't post it hence the (ooops!). I did post the site and got told off so have edited this thread with the info that is on the site that i found, and the pic is also from the site so they are the right ones! These too have no markings (check pic).