Quote Originally Posted by oldlock View Post
Externally the predecessor of the isolators ?

The top lock with the magnifier dial ring - is the lock any different to the normal lock ?
Yes it definitely has an early chrome Isolator look to it.
From what I recall on the mk3s I saw they had the normal big brass cased 4-wheel, with normal 10-lever double-bit locks covered with the normal CM chrome escutcheons on the front.

The brochure refers to this one having the top 4-wheel lock complete with spy shield and check-lock, 'controlling' the 2 key locks with anti-explosive guards. I'm guessing it will be the same lock but have to confess I haven't seen one with the full works 'combo dial' guards over the keyholes like on this.

Talking of the similarity with the isolators Ive got a few early Chubb Bankers, Treasury and early Isolator brochures boxed up so I'll post them when can I dig them out.