A couple of interesting Gold cases

These watch cases certainly won't be unique but I haven't been able to find any other examples or any information about them. They are contemporary with the Three Notch Longines I show for comparison. They were hallmarked in Glasgow for Veron Grauer & Company who were Agents who specialized in transporting high value goods, which doesn't really help me much.
These are heavy high quality cases and would have been a match for the likes of Rolex in their day.The flaptop has a Cortebert movement and poses another question, why one Swiss and One American?
Any thoughts regarding the case maker or the "watch manufacturer"or retailer would be appreciated.

Regards Harvey

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David has done a great deal of research on the A5M and related watches and their links to Veron Grauer & Company. They were only acting as agents so this doesn't help me in my quest.