Button Help and a Lead pencil?

[fyrffytr1]

I found this button a week or so back but can't find any info on the maker. It reads "G. Hobson & Co. 148 Regent St." And the thin lead piece is what I believe to be a crude lead pencil. It does write on certain types of paper

 

[creskol]

Wonder if it has anything to do with this:

 

[CRUSADER]

Lead stylus. Used by stone masons to mark out stone. They have been used for many hundreds of years, so near impossible to date.

 

[duggap]

Most of the time when we see those type buttons, we usually call them fly or pants buttons. Guess they could be used on most anything.