Everything else aside, you can bet that the cost of any replacement aircrew timepiece will be over-inflated. Why? Because they allways are!
My uncle was an ex wartime pilot and he offered some very sound advice... if it fly's, floats, or *ucks... don't buy it; rent it!
£500 for an aircrew timepiece... just buy two of 'em and leave them hanging on the yoke when the chocks are in... job done.