here a recording of OXT;
they identified with F1B-morse before starting fax-transmissions
(rb, 1985)
friendly & detailed letter and card from the collection of
Rudy van Dalen (1982)
see this verification letter
from the files of Joop Balneger (1985)
here a detailed QSL letter from the collection of Vladimir Rozhkov
(2004)
here is a look to their website
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Callsigns:
OXT
Frequencies FAX Picture Transmissions:
5850
9360
13855
17510
Frequencies Radioteletype:
13855
Systems used:
120 rpm
50 Bd