Compensating double French horn in Bb/A and F (MB1356) Overdue

Unbranded French horn with detachable bell and 5 valves, currently set up to play in Bb with no thumb key depressed, in A with the small thumb key, and in F with the large thumb key. The small thumb key can be used as a stopping valve to avoid transposing when hand stopping on the Bb side. Comes with a choice of three mouthpieces and a set of oils which should be used according to the instructions downloadable from here. It's in excellent condition considering it was manufactured before 1992.