What a great loss to the philately.
Stanley's eBay ID was stmpdlr, with a feedback score of 19,003. All lots are down now with the last two items selling on November 19, 2021.
I started doing business in his store, which he had taken over in 1976, in the very late 1970's when it was on Grand Avenue in Oakland near the Piedmont city line. He lived in Piedmont for years until he moved to Alamo to live and moved his office to the Walnut Creek tower (current) location.
Boy did he get me some great additions to my collection and boy, thank goodness, did he give me time to pay. With his prices, I needed the time.
Besides being a customer, I assisted him getting hundreds of pounds of material to G. Scott Ward's "kids room" at the APS St. Louis show over the years. Not many knew the support Stanly gave philately's workers and stamp collecting children developers. A far cry from the hard stare he'd give across a show table to figure if you were worthy for the "good bundles."
He was just one of four people who could call me "Danny" and live. My mom (generally not my dad), my wife and one of my Judo instructors, Professor Ken Min, PhD. (not a self called professor as in some martial arts, but a true employed tenured Professor of the Univ. of Calif., Berkeley). That is to say, I held Stanley in high esteem and he understood the privilege he had calling me by that name.
He was the owner of Position 68 from the sheet of the 1918 Inverted Jenny, Scott C3a.
His passing will leave holes in a number of expertising services. It also makes the last cover he sold me sadly just a bit more special (PFC 452591):

Like Stanley, an unusual combination with some unique features found no where else. The purchase transaction had all the best flair of a Stanley deal and back story. For all of Stanley's energy and philatelic drive, to die peacefully in one's sleep the day after returning from yet another major show, puts a quiet artfully embellished
finis at the end of a life well lived.
{RE: Cover, one cent parcel post add the extra cent to the one ounce WWI war rate cover; the USPOD had issued a decree that the five cent color error (Sc 505) was to have a face value for postage of two cents, not five.}