This AD50 was picked up at a bargain price, but with good reason. The oil filling the Bourdon tube had leaked, flooding the case interior, and without stripping the watch it was difficult to assess the full degree of damage.
Initially things didn't look too bad, but as disassembly progressed it turned out to be a right old train wreck.
As was to be expected, the watch did not run. The most obvious cause being de-lamination of the coil and, ahem, over-oiling.
The ‘ Fyrquel ‘ oil is awful stinky stuff and is as aggressive as you would expect a type of hydraulic fluid to be. It had wreaked havoc.