OFFICIAL VARIETIES: Official Government Issues
n Perforations: Different measurements, methods
n Experimental Perforations and roulettes perfins (e.g. OHMS)
n Pre-cancels: Different types and styles.
n Tabbed or otherwise treated for use in automated equipment
n Printed Information on Reverse, attached label, or selvage
n Specimens: Black prints and other publicity items
n Surcharges: Revalued issues
n Overprints: Geographic, commemorative, etc.
n Mirror Prints
n Gum Varieties
n Paper Varieties
n Test Stamps: For testing or dispensing machines
Read More…. in Issue No.70 of "ITS Stamp News"
For more details visit at http://indianthematicstamps.webs.com/