When I searched the Dutch I came across quit a view examples.
but searching for English examples I only came by this one;
This man is building a model of the USS Constellation and it uses a Spanker mast.
clearly visible on the picture when you click the link.
And on this page he is actually calling it a spanker mast, on the bottom part.
Here is a picture of the real constellation seen from behind.
I just noticed the previus post got edited while I was searching for information and making my post. And not for the first time Foremast Jack is right, snow mast it is. (but apparently spanker mast is used to)
I was a little disturbed by you being able to find some reference to "spanker mast" so I took another look around. It seems that on American Schooners (after about 1900) the aft most mast was referred to as the "spanker mast". What would normally be called the mizzen mast. The reason being that at this time schooners were being built with 4,5, and 6 masts (one even had 7 ). Since the spanker was attached to the aft-most mast and they needed a name, they just called it the spanker mast.