This old power supply comes from the mid-1960s. It's a model 160 He-Ne laser supply made by Optics Technology but rebranded to be sold by Atomic Laboratories of Berkeley, CA. Wish I had the head to go with it. I knew what it was when I saw the pic on Ebay because I saw the picture of the whole system in a book from the period. It's why old books and other industry publications have to be included in a collection like this.