"Inld Ptge/Ship Do" (HG SR6) on reverse (three across join) and completed with an all different selection of rates, two ex the same correspondence sent care of forwarding agents in Calcutta with similar type (HG SR8); good to fine strikes

Details
"Inld Ptge/Ship Do" (HG SR6) on reverse (three across join) and completed with an all different selection of rates, two ex the same correspondence sent care of forwarding agents in Calcutta with similar type (HG SR8); good to fine strikes
Further details
Note: Type HG SR6 was replaced during 1816-19 by the "King's Post" handstamp HG SR7. When the "King's Postage" Act was abolished, a new stamp, HG SR8 was made and used in 1820-21