Ron has replied on the other place. The general opinion is that if such records were ever kept they will be long gone. I rather doubt they were ever kept. The Irish guys have got a meeting of former R/Os in Limerick on Thursday and they are going to have a look. The current thinking is that the clockwork driven cam/s inside were cut for the A/A dashes and not the call sign but no one knows for sure. Worth a punt.
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