Ah, right. That makes sense. Great information - thank you.
My NOS TC1 screen has logo and script on the top surface, so unfortunately it'll be glass - my hopes are dashed.
A different UK brochure from a similar year, but probably slightly later, then starts to refer to the TC1 screen as "
ruby-red", rather than ruby. Looks like they made the correction :)
This brochure has prices and could date from when the watches first officially became available to buy in the UK, whereas the brochure claiming "ruby" could have been a preview article. It all checks out - so no ruby TC1.