Hello,
Great find I think it is pretty rare...
From various Ericsson history material by Pontus Staunstrup:
"Similar changes occurred in Europe. The Nordic countries and Great Britain were the first to start mobile telephone systems in the early 1980s, while other countries followed in the 1990s. However, the first country in the world with a functioning cellular system for mobile telephony was actually Saudi Arabia, which in 1981 took into operation a system delivered by Ericsson."
.....
"Ericsson’s entry in mobile telephony began in earnest with the AXE system. Thanks to AXE, which was the world’s first completely digital system, Ericsson had a strong position when contracts for the first mobile systems were awarded in the late 1970s. The Nordic countries all chose a version of the AXE called MTX for their NMT networks, as did Saudi Arabia."
.....
"The large Saudi Arabian contract, which was delivered in partnership with Philips, was expanded in 1979 to include a mobile telephone system. After a number of discussions, the parties agreed to use the NMT standard and that Ericsson would supply the entire system"
And a handbook cover from esato.com:
This phone exist in the database here:
http://www.mobilecollectors.net/phone/349