The best and most clear data for older Royal Portables exists only in these two pages gleaned from Bill Wahl’s collection of NOMDA (National Office Machine Dealer Association) line books from the early 1960’s.All of the other sources either completely ignore portables, or only run the first column of numbers for the higher-end portables and ignore the lower end portables in the second column.
Beeching tells you to treat certain “Y” prefix machines as if they came from earlier runs.
I suspect that most of it probably came from a typo that Mr.
Schumann might have made in his spreadsheet, as I found some instances where years were simply skipped.
by Johannes Meyer Verlag and Basten International, 1920 to 1949 and reprints If you have copies, please let me know how I can get ahold of at least the age list tables – I’d appreciate it.
The sources I do have access to all agree almost exactly as to the serial numbers and dates, and that was a pleasant surprise.
I suggest re-dating all of your Royals according to the new list.