Hi Alexander,
This is the earliest closely datable combined wheel-lock gun and crossbow. It came, as you said, from Schloss Ambras, The Tyrol, and is preserved in the Bavarian National Museum in Munich.
The measurements are:
Length overall: 73 cm
Length of barrel: 39.9 cm
Caliber: 9.8 mm smoothbore
I attach more images that I took myself. Sorry for the unusual poor quality but I took them during various visits there and was not always allowed to use flash. Moreover, they are 20 years old.
Best,
Michael
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