The issues until 1972 include the descriptions as published in the book as additional information, the issues after 1972 do not have additional information.
It can also be used as a more regular stamp catalog for the administration of your Lundy stamp collection and includes a have list and a want list.
The app does not distinct between the condition of stamps like used, mint, hinged, etc. for administration purposes, nor does the app have a valuation of stamps but you can manually add a price.
Only the major stamp numbers are included with the exception of a few overprint varieties and essays. The coins from 1929 and 2011 are also included.