Here's the answer to your questions that the mods are apparently too busy to answer...
Maybe they need a few more mods...Lol..
The primo amps from Spain used to be (few years back) brown glass with green writing on the amp itself. That is the primobolan, not the primoteston which also came in a brown amp, but with blue writing on the glass..I beleive that turkish and greek also used to come this way. Now they all use paper labels as far as I know...
Lot 0-51 w/ white ring around neck is apparently fake...
I do not believe that any legit primo has white ring around neck area..??
Lot 0-53 as described above is apparently real...
Although there are very good fakes of this product whereby the dot is somehow different.
Refer to site below for further info..
Refer to pic's forum at anabolic review for in-depth info and tests on various euro products by "Dutch Windmill" and "Dutchbodybuilder". They cover all the primobolan fakes and most have photos...
FWIW.