Can You Help Identify This Red Cancel?

Could anyone identify this red cancel?

It's a PAID cancel.

Probably an Exchange Office Paid cancellation. The largest use of a pair of these stamps was to pay the 24c per 1/2 oz rate to GB. The Exchange office in NY or Boston would have cancelled it with the date it was sent to a ship and what the credits of debits to each country would be. Red ink denoted credit, black denoted debit, as in "US gets credit of__ for the transport of the letter, with GB getting the rest."

Hope that helps.
Chip

Possibly a Providence RI regular Paid cancel if not an exchange. The paid on the 1869 cover linked below was used as early as the mid 1850s in boith black and red.

http://www.philamercury.com/covers.php?id=12125

I think it is a London transit marking.

It looks to me like its probably one of the tombstone London transit markings.