Duward Diplomatic Dublin — model D-95420 — Year of production?

I’m hoping someone here might be able to help me with a bit of vintage watch sleuthing.

The watch in the photo is a Duward Diplomatic Dublin, model number D-95420. I’ve tried to track down production information but haven’t been able to find anything definitive regarding its year of manufacture.

If anyone has period catalogs, brand knowledge, or has come across this exact model before, I’d be grateful for any info or even a rough production range.

Thanks in advance…

Duward Diplomatic Dublin — model D-95420 — Year of production?