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I polished the crystal, acrylic? with Autosol, came up a treat the only issue is the crack between 11 and 12. I was getting my knickers in a twist about this, going to replace it etc but its 51 years old I am calling it patina and living with it.
Some vinegar and water has given the case a bit of a birthday and a new Nato strap to finish it off.
It keeps time really well, if its not broke I'm not getting it serviced. Makes me sad I had it in the loft for nearly thirty years :(
@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.