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Very cool - is it an acrylic crystal? If so, there's a polishing compound called polywatch that would buff out scratches, though in a pinch toothpaste works! Otherwise I'd leave it; you might want to get the movement serviced as the lubricants have possibly dried out, but other than the new strap that's perfect.
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@Merak That's a superb example of a Hamilton 6B. I think the H67 model was released in 1967 and may have effectively been an MoD "trials" watch which makes it slightly rarer than the plain 6B. The crystal, and more importnatly the tension ring inside are original to the watch which is not always the case. As is the winding crown.
To polish the crystal, you can take the deeper scratches out with wet&dry (go for something like 800 and 1200 grit) and then finish off with Brasso, Autosol, or a similar cutting compound. Do not touch the bezel.
Alternatively, you can replace the crystal with a new tension ring crystal and transfer the old tension ring into the new crystal as these are unique to the watch.
I've owned and worked on many of these, so give me a shout if you need any advice. They have become more popular in recent years since the IWC Mk11 has become unaffordable for most.
This watch belonged to my Dad. He died 28 years ago. I've never worn it but I wound it up today and it worked!
I'd like to gently restore it. The glass is covered in scratches. I don't want it to look like new just refreshed. I'd like a NATO style strap for it too.
Just wanted some opinions really.