This week I had Heckel 5751 on trial from RDG woodwinds. This bassoon was made in 1922 and has been modernized with a high D key, E key, rollers, and tone hole inserts. The stain and lacquer is in amazing condition, maybe part of the restoration.
The new keys have been added in a tasteful way and the key casts match the originals. However this bassoon still has the original ivory bell which makes it difficult to travel with.
This bassoon has a lovely sparkling voice and is still available at RDG