Plenty of ThorntonPickard shutters
Currently there's a lot of these excellent shutters on Ebay (in the UK) at the moment many from the same seller finishing around the same time. This is unusual and will mean they fetch less than normal. £20/$33 would be a good price.
These shutters are very easy to repair, but all appear to function OK, the cord is a simple to replace if missing.
I've just fully re-furbished a real dead beat Thornton Pickard shutter sold for parts, and it now functions perfectly although I need to make a new cable release mechanism. But there's no Rocket science they are extremely simple & logical :D
I may buy another :)