The Imperial Council of Mystic Shriners held a convention in San Francisco from June 9^th to the 14^th,,1902. It appears, from newspaper accounts, that trains coming from the East stopped and unloaded Shriners in Salt Lake City, where they did some touring of the area, then continued on the train/s to San Francisco. There was a contingent from Grand Rapids among the gatherings’ more than 1500 attendees, probably all wearing one the these pins. 

It is unknown who made the item, but it might have been E.M. McInerny & Co. at 151 Monroe. A McInerny & Sprague advertisement in the 1891 city directory lists the company as, "Manufacturers of Lodge Supplies and Regalia for all societies." In the 1902 Grand Rapids City Directory E.M. McInerny is the only company listed under 'Regalia' in the business listings. "E.M" was Ellen M., widow of John McInerny.