Wahl Doric. 2nd Generation-- "shell" color era, mid-late 1930's-- economy (non-gold-seal) model in green/emerald. Gorgeous pen. But, typical cap-band as documented is a thin open-work thing. I've seen couple before like the following, with wide solid cap-band. Off-catalogue and tbomk undocumented. Not sure there has been any discussion online ever of this variant, but with all the babble online, I could be wrong.
This is a wee gem. Scarce. Beautiful. A classic from the 1930's. We can speculate as to "why" of this pen, but the guesses are typical to any pen from the era with off-catalogue features: seasonal item (?), low-run for specific store chain (?) and so forth.
Comments, questions, insights of course are invited.
regards
David