The first stamp used on the base of the lighter bore the legend "PAT. This was used on lighters manufactured until around the end of 1950. There are many examples of "Pat Pend" cases with "Pat 1950" inserts (see below) these lighters would have been made around the time of the changeover at the end of 1950 using stock cases and newer inserts.
Contact Dunhill customer service via email ([email protected]), attaching the digital photographs of your lighter and its serial number.
A representative will investigate the manufacture date of your lighter and get back to you.
Look for a serial number on the bottom of your Rollagas lighter.
If the number is there, the lighter was made in the 1970s or later.
From 1933 to the mid 50s, the word Zippo was stamped in block letters. What began as a quality-control tool for Zippo founder George G. To identify a potential pattern in any run of lighters returned for repair, the bottom of every Zippo lighter was encoded with a series of markings.