An updated Model Register was published in 2015, Bulletins 552-554, and available separately from the AOC. This is an extract from the 1996 Model Register:
A Gallery of SAs (351 built)
For details of a current restoration click RESTORATION STORIES
The later models of the Speed 20, types SB SC and SD have their own page. click Speed 20 SB
The 3½ Litre or Model SA25.63 has its own page, click here The 3½ litre introduced at the 1935 Motor Show for the 1936 season.
The Speed 25 has its own page, click on Speed 25