Appears to be a fairly typical No.4 Mk.1 made at the Fazakerly factory near Liverpool. The screw is the ejector, and is a #3BA thread. EA prefix is typical of this production, many (most?) of which have an A-suffix on the number.
Appears to be a fairly typical No.4 Mk.1 made at the Fazakerly factory near Liverpool. The screw is the ejector, and is a #3BA thread. EA prefix is typical of this production, many (most?) of which have an A-suffix on the number.