“What nut has no shell?”/“A dough-nut.”

A donut/doughnut riddle is:
 
Q: What nut has no shell?
A: A dough-nut.
 
“What’s the only nut without a shell? A doughnut” was published in The Evening World (New York, NY) on April 2, 1903.
 
 
Chronicling America
2 April 1903, The Evening World (New York, NY), “Conundrums,” pg. 14, col. 4:
What’s the only nut without a shell? A doughnut.
 
30 December 1919, Wilmington (DE) Morning News, “Shamrock News and Views,” pg. 9, col. 1:
P. Lyons would like to know what nut has no shell.
 
27 March 1921, Indianapolis (IN) Sunday Star, “Who’s Who,” pg. 35, col. 5:
“WHAT KIND OF A NUT HAS NO SHELL.” A FOOD PRODUCT MADE AND SOLD TO CONSUMERS IN INDIANAPOLIS?
 
22 August 1926, The Sunday Star (Washington, DC), pt. 5, pg. 7, cols. 7-8:
363. What nut has no shell?—Mary Frances Barry, St. Louis, Mo.
Answers.
363. A doughnut.
 
Google Books
Biggest Riddle Book in the World
By Joseph Rosenbloom
Illustrated by Joyce Behr
New York, NY: Sterling Publishing Company, Inc.
1976
Pg. 105:
What kind of nut has no shell?
A doughnut.
 
18 December 1996, The Sun (London, UK), pg. 6:
What nut has no shell? A dough-nut!
 
Twitter
Kobbie‏
@djkobbie
What kind of Nut has no shell ?
DoughNUT !
4:47 AM - 10 Dec 2009
 
Google Books
New Jokes4Kids Joke Book
By Paul Gwilliam
Lulu Publishing (Lulu.com)
2013
Pg. ?:
What nut has no shell?
A doughnut.
   
Google Books
Jokes for Kids:
Jokes, Riddles, & Tongue Twisters That Will Tickle Your Ribs &Make Your FUnny Bone Laugh
By Nicole Townsend
Lulu Publishing (Lulu.com)
2014
Pg. ?:
Q: What kind of nut has no shell?
A: A donut.
 
Twitter
Barbara Danza‏
@BarbaraDanza
What kind of nut 🥜 has no shell?
A doughnut. 🍩
#kidsjokes #lunchnotes #parenting
6:43 AM - 28 Mar 2017