Quote Originally Posted by safeman View Post
That was #12116 with the small key unlocking the shutter which was in turn controlled by the knob handle. I believe that this shutter was at one time made of platinum. Could you be so fortunate?
Aha, so the knob controls the shutter and the drop handle the boltwork, thanks safeman.

Struggling to get my head around the use of Platinum on the shutter though, can't think of any of its properties that would suit the application here in terms of tensile/impact strength, anti-drill etc, not to mention it's generally around the cost of pure Gold bullion, and at times has been valued much higher.

Something like a Tungsten dense metal alloy I could understand for numerous reasons, but I don't think the technologies for sintering the heavy Tungsten alloys were around then, can you tell us any more safeman?