This teaspoon is part of a set of six. They are all hallmarked for Birmingham 1905. However, I can't figure out the large 'F' mark. My first thought was that it was the import mark, however I have never seen the import mark stamped inside a triangle. Plus, as far as I know, the 'F' was not used after 1904. In addition, the spoon has no makers mark. Is there any chance that the 'F' is the makers mark?!? I really need help figuring this one out.
http://m1.freeshare.us/view/?149fs26578.jpg
http://m1.freeshare.us/view/?149fs268337.jpg

