There's plenty to be found on James Geddy Jr. (and his brother John) including this reference at page 73 on his occupation:
https://scholarworks.wm.edu/cgi/viewcon ... norsthesesHis marks have been established and are accessible. Apparently the facsimile mark is used to denote works from the rebuilt foundries in Williamsburg, but I'm not certain that these are all actual reproductions of the known Geddy spoons, though the Stieff might be. The Gutenberg Project has another accessible on-line book work, but with a warning to consult copyright laws by countries. The related deMatteo silversmithing history has plenty to be found including a great thread on SMP forums. Have not found much discussion on Mr. Berg (Bergeight by one reference?) who worked mid-20th century, but he may be a co-author on a Williamsburg book.