Here is my copy of the cover you show:
I don't who produced this cover but I had thought it may have been an unbranded Royal. The cachet on my copy is a little sticky, even after 50 years, which is a common trait of Royal fdcs of this time. Royal tried to copy Wesley Cover Service "Verko Print" & didn't get it 100% right & consequently on a lot of their covers the ink often did not completely dry.
However. if it were a Royal, I think we would see more of these out there.
Your thought that these may have been sent to dignataries, members of a club or customers of a company is a good one but who. Perhaps it was OTC (Overseas Telecommunications Corporation) & maybe Royal printed the covers for them? Hopefully someone out there may have a copy with a card or letter inside.
Gus, can I ask you to do something for me?
When you post an image, can you do the following?
Please press the place in line button below:
You will find it here:
If you add a description in the file comment box then it will assist Googlebots in their searches & more users will find your images.
It will also save me time by not have to fix your posts to remove the word "attachments" from every post when place in line is not pressed.
Brad for the Moderators.
Specialist Collector of World Horse Racing Covers, Melbourne Cup & Kentucky Derby, & JFK fdcs.