New Booth Pic?

[L Verge]

I am leaning very heavily towards the photo being of Emerson after comparing noses and ears. I have also fixated on that hat. After visiting about a dozen sites online, I'm pretty sure that it is what is known as a mechanic's cap, or watch cap, or wheel cap (all terms interchangeable). That style was popular mid-19th century, especially after the Mexican War. However, it was generally worn more by working class men. It just doesn't seem "Boothsonian" to me.