Caution: the Seydel Session Steel does not use the same reedplates as the 1847 models !! 
See this page and notice that the reedplates for these two models are listed separately and cost is higher for the 1847 reedplates. I own both Session Steel and 1847 models and have taken them apart, so I can absolutely verify that the reedplates are not the same. Also read the fine print below the picture on this page where it says that the reedplates are not able to fit in the other model.
The reason for this is that the Session Steel uses a recessed comb design but the 1847 models use a sandwich design for reedplates. The size difference is minimal, but crucial. The quality, however, seems to be equally good for both designs.
Regards,
– Slim