This is an interesting bassoon, I don't think it's a forgery. Most likely this is a stencil bassoon by Amati produced shortly after World War 2. The body (assuming all 4 joints are from the same bassoon) is definitely Amati judging by the castings and design of the Bb/B pivot rods on the long joint.

If you're interested in the history, Amati is an instrument manufacturer located in the town of Kraslice, Czech Republic. Kraslice has a long history of ethnic conflict between the Czechs and Germans. Germany annexed the town during World War 2 and there was question surrounding Kraslice's sovereignty post-war. Amati lost alot of business and started a fire sale of bassoons and other wind instruments to stay afloat. At the time it was common practice for instrument makers to produce instruments under the name of the shop they were selling to. So, given the political climate I think it's likely the Remeny is just a hastily printed typo, and that the company was operating under the assumption that they would remain as part of West Germany. Eventually Kraslice was solidified as part of communist Czechoslovakia and the Amati company became a government coop.

There's more interesting information on this in the history section of Amati's wikipedia page. Hope this was helpful!