INDIEN "used abroad" ?

Übersicht mit KI, die hier vernünftig scheint (siehe insbesondere betreffend Design):

East India postage cancellation marks featuring the letter 'C' primarily refer to the Calcutta postal circle, often utilized in early British Indian postal history between 1873 and the late 1880s. These marks were used to cancel stamps, primarily on "East India" inscribed stamps, as part of a nationwide reorganization of postmarks designed to facilitate faster processing and higher security against stamp reuse.

Key Aspects of 'C' Cancellations (Calcutta Circle)

• Context & Time Period: These are part of the Renouf type 32, 34, and 35 series, introduced India-wide between 1873–1884. They represent the Calcutta Head Quarters (HQ) sub-district.
• Design: These cancellations usually appear as a duplex, combining a circular date stamp (c.d.s.) with a square or rectangle of thick horizontal bars containing the letter "C".
• Sub-Districts: The 'C' series covered a vast area, including sub-district distributing offices in Calcutta and Assam (marked G).
• Variations:
  • C-1 (Calcutta-1): Commonly used for early mail departing from the main Calcutta G.P.O..
  • "C" with Numerals: Later, "C" was often paired with numbers representing specific sub-offices or branches within the Calcutta circle.
  • Cooper Types: These are referenced in early postmark studies as Cooper types 32-35.
• Other 'C' Marks: Some early "Paid" marks or "Cross" marks might include a 'C' for Calcutta, but the 1870s-80s bar-type "C" is the most prevalent specialized numeral/letter cancel for that era. 

Other Early Indian Cancellations

• Renouf Type 1 (Diamond of Dots): Used in the 1850s, sometimes found on early East India stamps in blue or black, with 9x9 or 8x8 dot patterns.
• Numeral Cancellations (Num-Cancel): Numbers in squares or bars indicating specific post offices (e.g., '1' for Calcutta, '2' for Bombay, etc.).
• District Post Cancellations: Specifically designed for regional mail, sometimes including names of areas. 

Philatelic Significance

• Cancellations with specific letters (A, B, C, etc.) are highly sought after by collectors for reconstructing early post-management and verifying the place of origin of the mail, particularly during the 1854-1880 period of East India Company and early British Raj mail.