If you are referring to the .22 trainer it would be a C No.7 Mk.I produced in Canada or a No.7 Mk.I produced in England. If it is a C No.7 and has it's transit chest and all that belongs inside it I would say it could get over $1000.00. If it is the No.7 Mk.I ( No "C" ), of British manufacture, complete... I would say considerably more as complete examples are very scarce. If it is a British No.7 which is missing the Bolt head, Ejector and magazine I would say $150.00 to $200.00 is fair. Just my thoughts on it.