It looks like a Turner No. 52 or 52A. I have a really good blowtorch book -- Vintage Blowtorches, an identification and rarity guide. by Ronald Carr, Charles Smith, and Graham Stubbs. I had a pretty rare blowtorch a few years back, and I sold it to one of the authors for a fair price, and he gave me a signed, numbered, first edition also. The Turner 52 and 52A are listed as a Two Star Rarity, uncommon, distinctive features, fairly easy to find.