Does anyone know what model this is please? it was given to my grandfather in 1957 by his work.
Is it safe to wind it up - (it’s not been used in 20 years) or should we have it serviced. Thanks

 

Have it serviced before you use it regularly

 

But bear in mind it looks like a very poor redial.

And lose that awful, lug-damaging, metal watchband!

 

If I were to wear your grandfather's watch I'd get it serviced and replace that dial because it is a bad re-dial. That's not taking into account any sentimental attachment you might have for the watch as it is. It looks like someone created that dial in their back shed judging by the uneven placement of the plots around the perimeter (eg. between 12 and 1) and the IWC logo is incorrect and too large. Below are what the logos looked like over the years so you can see the correct styles and sizes relative to the dial. Chart from Vintage Caliber.

If you pop the caseback off and take a photo of the movement the calibre should be identifiable. If you prefer to change the dial you can probably source one off ebay, IWC forum or elsewhere.

 

Thanks!

 

Thanks!