261740 - Barrackpore

Wider spaced:

29 November 1971, Ichapur Nawabganj. 

Seen from all over Hugli District and North 24 Parganas, in late 1971. Very widely spaced lines distinguish it from any other type of 261. Here used on Government Service, other examples are all for normal postal use.

Closer spaced:

261wba - Nadia

Very small, always blurred sans-serif letters, all dates seen are 1972