The “Database” is probably the biggest source of typewriter serial numbers in the Internet today.
As far as I know, it’s even the most complete collection of serial numbers ever.
Its primary task is to help collectors, to date their typewriters, by the serial numbers of the machines.
The data in the database is pretty reliable, since listings of different sources were compared and evaluated, but please don’t hold me responsible for any mistakes in old listings.
Royal typewriters were first manufactured in the early 1900s by E. Later Royal versions varied wildly in their design and, though popular, are not prized as collectibles.
The " R" in the Royal name has a long flourish on the right side that wraps underneath the word and stops under the first leg of the "A." In later models, the flourish extended under the entire word or was eliminated as the name was printed in block lettering.
Look for a typewriter that has gold lettering on it, found on the Royal 1 model, or silver lettering found on the Royal 10 model.
The PREFIX letters refer to a common general group of parts and are used for internal (company or repairman) identification only.
The regular model numbers as used for advertising, sales and identification are clearly delineated as such.