To Black Phoenix, thank you for your suggestion (and apologies to Benta for not acknowledging him by name in my reply - I'm new to this system of communicating!). I had a look on-line (at Alcatel products) to see if I could find anything even remotely like what I have, but as mine predate the Internet by about a decade, not surprisingly without success. Hence posting my question here, hoping - admittedly a very long shot - that someone who watches Dave's videos (and also looks at this forum!) might actually recognise it. Because of the age of the boards (30 years), I would think anyone who ever worked with them would probably have to be near or past retiring age, which lengthens the odds even more.
But, you say Alcatel-Lucent board naming is (was!) similar to that on my boards? Do you mean the "CIP" names or what I presume to be a drawing number, which I see on the "carte" labels*, they are all of the form "5111.199.5xyz", so I wonder whether anyone recognises that format for drawings with their company; perhaps I should have mentioned that in my original "posting", but I've only just thought about that (and gone back to the boards to look at them again!)
(* at least, that's what we did where I worked at the time, though in the silk screen or top/bottom copper layers.)
Regards,
Chris.