SC06 7mm scale Southern Railway/BR Southern Region signal lamp (pack of 3)
This whitemetal casting represents the standard SR/BR(S) signal lamp case. Dimensions are approximately 11mm high (18mm including the bracket) x 6mm 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.