I talked to my mate via phone call who is a vintage bottle collector & enthusiast .
He says the clues to the bottles age is given by the type of seam, especially around the neck, also the bottom of bottle could have clues too .
He was not able to see the pictures but i described it to him .
Hes in some mountains on assignment so cant look for a few days at the pictures.
Just from the discussion on the phone we had , it was clear that the brown bottle is much older than 20 years .
I formed the opinion that the bottle is approximately 40-60 years old.
A safe bet would be that the bottle is made before the claremont murder victims were born, imo .
https://www.gumtree.com.au/s-ad/dun...d-crown-seal-full-and-half-bottles/1156144357
http://www.bottlebooks.com/Dating Old Bottles/determining_the_age_of_old_bottl.htm
https://sha.org/bottle/examples.htm
QUOTE from article below ::
They have been a huge torment to myself and my family in giving cryptic clues as to where Sarah might be, he told the ABCs Australian Story in February."
"A frustrating aspect of this sorry saga is that the callers to the Spiers family were almost certainly acting without malice. They were only trying to help. A dream or a thought had popped into their heads and they thought the information should be passed on. Just why did they give credence to these visions?*"
https://vicskeptics.wordpress.com/2005/02/22/murders-and-clairvoyants/