1930s King New Yorker alto

I've sold off most of my altos due to my recent jaw issues but decided to find one inexpensive alto just to have in case things changed. I picked this one up pretty cheap, and just had it worked on and wow, I am sort of amazed. The sound and action are terrific, it's got that nice, wide, older-horn sound. But I have never heard of this model. Is it a Tru Voll? A Zephyr in disguise?
Serial number is 156***, which puts it in the early 1930s, I believe. Anyone have an idea?