Kept this email until I got a chance to look at my 300K mirror, which I did today. Thought I remembered it having the single (300F type) chrome lever dimmer control. It does have. Don't know what is going on here. Probably Andy is correct in assuming different vendors, or at least by 1964, going back to one used in 1960/61. 300ly, Gil [Non-text portions of this message have been removed]