You need to refer to the Lingford catalogue, where all the legend varieties described by him are listed (13 obverse and 20 reverse varieties). The top one is 1552 obv.A and the second was not listed by him, though the obverse configuration with just a colon before the tun does appear in 1553 as his 1553 obv.B, so is likely a late die. I haven't compiled an exhaustive database of images for these, so can't say how rare the bottom one is, but don't have any examples to date. I wouldn't lose any sleep over the lack of stop - it's just another die (even if not recorded by Lingford), and probably specific to just this one.