This is one of my Mom's swan salts, bears the 1st standard Minerva and a maker's mark for Tirbour, have found the "CT" Charles Tirbour marks but have had no luck tracking this one down. Anyone know the date range for this mark? Thanks!
Thanks, Pat! Suspected the symbol might be their little suitcase, its illustration in that book seems to reinforce my gut feeling that the piece dates to the early 20th century.