Astleys Bamboo-shank Smooth Opera. This is a rare one! I have not been able to find another example of an Astleys Opera or an Astleys with a Bamboo Shank, and here we have both together! Condition: 4.5/5 light rim darkening, light oxidation. Chamber: (0.63 x 0.92) x 1.43. Weight: 1.6oz (44g).