I hate watermarks

 Into the ??? box for this one. There are several varieties of this issue and all require you to have a keen eye and a bottle of watermark solution. Since I lack either of those I'll need to wait until I pick up some solution and maybe with the assistance of a powerful magnifier I can deduce what I have here. Whatever variety this turns out to be, it will be a much welcome addition. This is one of the earliest stamps as all the Queen Vics are.

JimmyB