Aloha and welcome to the interactive key for pre-1940's Hawaiian soprano ukuleles. To get the most out of the key, please read the "Using the Two Column Key" article accessed by pressing the down arrow in the "Two-Column Key" box below. For more details about the measurements see here: https://ukuleles.com/ukuleles/collecting-ukuleles-memorabilla/hawaiian-ukulele-characteristics-database/ . We are still very much at the beginning of the key development and would welcome community input. Please contact me at makule dot kawika at gmail dot com if interested.