given that you have 2 tubes that measure 28mm and the strong possibility that the top tube is actually 26mm (maybe a little thicker due to paint) these are metric tubing dimensions: it's 99% certain that it's not British. So probably French. Very slightly possible it could be from another Continental country (Belgium, Spain, Switzerland) but I wouldn't bet on that. Also since you're in Brazil, there's been a bicycle building history in Argentina, but I also doubt this is from there. Metropole is not a brand I've heard of, but probably somebody has...I'd say Norris Lockley might know, maybe we can direct his attention to your pics.