SSW 820-831
These units were built in two batches, the first of which was delivered in 10/1957 with serial numbers 24075-24080 as SSW 820-825 in black widow paint. The second batch was delivered in 2/1959 with serial numbers 25016-25020 as SSW 826-831 in grey and red or bloody nose paint.
SSW 820-825 - 10/1957 - black widow - builders numbers 24075-24080:
| SSW 820 | SSW 821 | SSW 822 | SSW 823 | SSW 824 |
| SSW 825 |
SSW 826-831 - built 2/1959 - bloody nose - builders numbers 25016-25021:
| SSW 826 | SSW 827 | SSW 828 | SSW 829 | |
| SSW 830 | SSW 831 |