Nice one! Although if he did it in 1990, he was not riding "retro" then, but the latest of the market! ;-)
Here is a 1991 Cignal Silverado I used to cycle from Shimla (Himachal Pradesh) to Leh (Laddakh) in 2015. I left the bike there, so with luck someone in Leh is still riding it!
I can definitely recommend this book as some lockdowns touring inspiration, not that most people would set out to do this ride, but it’s a good read nonetheless.
I've done it a few times: Portsmouth to Ouistreham, then along all the way to Juno and beyond. There is a write up in this thread on page 29.
Page 47 has a trip to Utah beach and Ste Mere Eglise for the Airborne assault last year, looping from Cherbourg.
I think some 24/48 hr sojourns may be as much as I can hope for this year. Had a couple of days rising booked in for the start of April (and the weather was great, typical!) but that was postponed, obviously.
I can definitely recommend this book as some lockdowns touring inspiration, not that most people would set out to do this ride, but it’s a good read nonetheless.