A lot of effort and some good information
@sphinx77
just a small correction to the info you gave
this was (generally) reversed in the mid sixties - whereby the brickwork observatory appeared on non-gold cases and the gold cases had plain observatories.
but in true Omega fashion there were exceptions to the rule just to keep us on our toes.
link to Desmond's essay on medallions if you haven't seen it:
http://users.tpg.com.au/mondodec//Constellation medallions.pdfClick to expand...