I was surprised to see the one and only Esterbrook in the lot had a flat bottom which wasn't evident in the auction photos. Sadly, it's missing it's cap. Pity to, as it's a lovely green Transitional model. Research has shown me the imprint on the body is that of a Transitional single jewel J series pen. I'll keep it in my rapidly filling up 'pen parts-and-repair cigar box' in the hopes that I come across a cap for it someday. The real kick in the short hairs though, is that I have a perfectly matching cap for it already, but it is cracked at the top under the clip, and missing the jewel.