From time to time manufacturers produces some very small pens. here besides an Esterbrook SJ for comparison is an Eclipse Mary Jane and a Salz Bros Peter Pan. http://i751.photobucket.com/albums/xx153/FPWriter/threepens_zps4067ed73.jpg Popular history of the Eclipse brand tells us that the founder made pens named for his children, and this 1933 Mary Jane was intended for a small girl to use. It has tipped steel nib. The Peter Pan pen had an entirely different focus. The pan in inscribed with "The Green Room". It came from a 1935 New York hotel bar and would have been intended for signing bar bills. It has a spoon nib.