Genuine Solid Copper Head Gasket New Old Stock Just Dirty I Have Cleaned Them All Up, & They Have Come Up As New Also They Have Revealed A Part Number Stamped In SC1A745.Pictures 2 & 3 Show What They Look Like Before & After.
They Measure Up At 70mm Bore So I Am Assuming They Are For Super Meteor / Constellation 69.875mm
As The Interceptor Was 70.915mm
Please Ask For Any Queries.
I Have Just Had a Message From 700cc Owner Who Said He Has Just Opened These Out Easily Enough To Suit The Bigger Pistons Thanks.