Thanks Andy,
1093 is the batch or assembly number. I couldn't make out the scratched date in your pics. It is unclear if the batch/assembly numbers were a code or (more likely) ran consecutively until the batch was completed before starting from the beginning once again. I am hoping that as many collectors as possible supply letter codes and dates of Premiers, as that may provide a pattern. There have already been a couple of anomalies with the Premiers, so deciphering some kind of order is not all that easy.
Kind regards,
John