A Bisect is a stamp which has been cut or perforated into two parts for seperate use. This is often when there is a shortage of stamps.
These are best collected on a piece or cover with ‘tied’ postmark. A stamp is said to be ‘tied‘ on cover or piece when the postmark or cancellation extends beyond the margins of the copy and is legible on the cover itself, thus proving authenticity. This is particularly necessary in the case of bisects.