Wow these are awesome examples @Pellinore . I would gladly accept any and all into my collection. I am glad there is at least one other guy with these. I like the fact you have left facing busts, all of my examples are right facing. Your top specimen is quite large for the series. Word on the block from the online reference is there are some in the 20mm range. I do not have one and there was not one available in the hoard. All of the coins of the 2014 hoard are all of different types, dies but fitting the weight range of 0.5-1.2 grams. Most are on the smaller end 12-15 mm.
Yes, most of mine are quite small. I have 5 of these coins (I think). But I'm more and more a collector of contemporary imitations, and at this moment I don't know if I can say farewell to one of these.
Roman coins have been found as far away as Vietnam. The Silk Road was a very long route - I don't believe many travelled the full length of it, but goods certainly did.