Hello Ton,
I thought my suggestion was a bit 'basic'
I was not sure how much you knew about the subject, but it is obviously a lot more than me!
Thanks for the information regarding the rates and though we do not collect telegraphs as such, any information regarding philately is grist to our mill.
My wife and I both worked in Overseas Telegraphs in London (longer ago than I care to think of) and I worked in the Post Offices in various places for the majority of my working life, and that obviously included telegrams. However I have forgotten so much. .
Thanks for sharing.
Regards,
Ron.