I got my first Brazilian visa in 2007 in Chgo. It is a blue stamp that takes one page. It was good for one year.
In 2008, I got another one, good for 5 years. It is just like your description:
The visa is glued to my passport with a clear strip on 1/3 of the page. My photo is on the left.
Call if you want, but don't stress. I think you've got the real thing.^