I remember cream in half pint bottles of that type, but in Melbourne we also had milk in the 1 pt. version also. I found some on eBay from Model Dairy in Kew, but I think other dairies used that bottle also.
At least you've got a good print to talk about. My darkroom efforts over the last two days have been fruitless, so I reminisce about trivia instead
. (Worked all afternoon yesterday trying to print a grossly overexposed 4x5 neg [petzval, lens cap exposure] and today an 8x10 contact of a subject which I now realise was not ideally focused). As in every pursuit we have good days and not so good days.