Dating two Bushmills bottles

[Pete]

Hi all,

Please can you point me in the right direction to date two Bushmills bottles I purchased at auction. I plan on side by side tasting with their modern counterparts.

They both appear to be screw tops. I'm not sure how to use the glass markings on the base to help with date.

Pics of the bottles at these links:

Bushmills Blackbush https://imgur.com/gallery/yFlLs

Bushmills 10yr https://imgur.com/gallery/E6eQm

Thanks!

[Good Whiskey Hunting]

I think both are 1990's bottles.

[IrishWhiskeyChaser]

Possibly 80's also or early 90's. They started to use corks for these by at least the end of the 90's.
I would imagine there would not be any major value on these

However the Blackbush would be a far better whiskey than today's version with more Sherry influence in my opinion.

[Raven]

However the Blackbush would be a far better whiskey than today's version with more Sherry influence in my opinion.

You are so right on that. It was an iconic whiskey !