Swiss Nero Lemania Eight Day Aircraft Cockpit Clock

Swiss Nero Lemania Eight Day Aircraft Cockpit Clock

I have never seen this item before but an internet search shows a similar one described as …

“A Swiss Nero Lemania Eight Day Aircraft Cockpit Clock, suitable to be mounted in a dashboard, with winding handle, the verso with oval metal plaque Camerer Cuss, 54-56 New Oxford Street, London WC1 Aircraft clock type NL 7510, serial number 5059/61, also labelled The Ultimate Choice British Airways Engineering Technical Workshops, 6cm diameter “

The polystyrene holder has the type number stamped as (also) 7510 but I cannot see any serial number (maybe it is on the inside somewhere?)

I am scarred to overwind it, but when I turn the winding mechanism slightly, it starts to go for a while. I assume it is in perfect working order but because I am unfamiliar with these kinds of items, I will extend my 100% money back guarantee to 10 days. If you are unhappy with the item, you must return it within 10 days without rating me negatively. If you disagree with this, please do not bid. 

Please see the following pictures.