To find out the ratio (PG, HG, XG), you can just count the number of rotations of the rotor for each turn of the handle.
4.9 for each turn then it is PG.
5.6:1 means it is HG
5.8:1 means it is XG.
I am not 100 % sure of the ratios for PG, HG and XG of the SW-A (this one). They are from memory. The "new" SW-B has other ratios.
It is true what serge says about the handle knobs but it could have been switched after purchase.
On your model, the handle does not fit directly into the opposite reel plate. You need to change the steel pin in the handle to make it fit on the opposite side. It is not difficult but of course you will need to acquire it if it didn't come with the reel.
Regards