SC006 4mm scale Southern Railway/BR Southern Region signal lamp (pack of 5)
This whitemetal casting represents the standard SR/BR(S) signal lamp case. Dimensions are approximately 6mm high x 3½mm wide across the lenses.
Post-grouping conversion of signals to upper quadrant arms normally saw replacement of the original lamp with this type, as the lamp would have to move from the right to the left hand side of the post.