Four different batches pictured from two seperate sources.
x1 red ink - 265 8/2014
x7 black ink - 20104294 12/2015
x1 black ink - 20103285 07/2015
x3 black ink - 20111297 02/2016
Mass between amps varied by .11g which is a lot for pharma amps (they were wiped and blasted with compressed air so external dirt shouldn't be a significant factor)
Height varied by up to 1.5mm as well as circumference at widest point of neck.
Exp and batch number printing style varied with smoother black on 2015 amps and sharper dot print on 2016 amps.
(No inaccuracy with scales. 10ml vials usually only vary .3g-.9g. UK prescription amps vary by .1g)
Bad quality control?