Hi let me just say first thank you for ya'lls time. I was trying to find some info I recently acquired, a antique stamp machine, I don't know much about it though so any help will be greatly appreciated. All I know is that is has slots for nickels and the one side for a 10 cent value and the other for a 5 cent value. It has a plate that says Coffman Stamp Vending Machine, Manufactured by Coffman Manufacturing Company, Fort Worth, Texas Patent applied for no. 238. I came across the Union Station Kansas City Museum and noticed that they have a archive dedicated to Samuel McFarland Coffman. I got in contact with the Curator of Collections and she helped me some and referred me to others as well told me to contact the Smithsonian Museum but I can't wait, eager lol. So I come to you all for help. Thanks!