On a similar vein, which would cause quite a few heart attacks these days, the first Export Hawk ( to a place still officially secret but well known, it begins with K and ends in Ya ) the fitters had installed a beautifully made, flanged & rivetted banana rack in the forward cockpit - it was only discovered 1,1/2 hours before the big handover ceremony !!!
Before anyone replies, I agree this was going too far, but they were different times.
A Harrier T4 was left for collection with an 'Auto-Trade' style sign in the windshield, " 4 new tyres, 2 new wings, shoddy hoods ( the chap who worked on canopies had upset someone ) hence reduced price..."
The baro' altimeter was also marked ' Sunny, Fair, Rainy' etc.