Just looking back at an old record of department purchases since 1957.
Tracked done one of our remaining AVO's 8 mk III and ,atching serial number it seems we bought 6 of them for £128 in Aug 1966. So about £22 each.

Just found it interesting wonder how you would factor in inflation and what they would be in todays money.

We've just bought a scope for £31 each last week :-)

Think I have another 10 in the post room today to collect.