I have a BSA Club with the E prefix. It has the shorter compression chamber and the shell shaped latch. I think I paid about £280 for it about three years ago. I had it serviced by SFS and it shoots OK although the sights lend themselves only to average accuracy. It was not in good condition when I got it ie. no blueing and the stock had definitely seen better days
I also have one with an EC prefix which is indistinguishable in looks from an Airsporter. It had been refurbished and looks very smart but I believe purist collectors don't go for these as the "BSA" marks on the top have been over blued. This one shoots really well.