Crane pre-war Lavatory Stem
4-1/2″ overall, 3/8″ diameter. Used in most slant back and shelf back wall hung lavatories with escutcheons held on by nut, including early Drexel and metal cross handle models. Also used in the occasional Kitchen application. Same stem used for both hot and cold. Made in the USA.
Note; overall length can vary by application. If your stem looks like this one, but is shorter, this one will still usually work, it simply moves the handles out a bit more.