Is this an 8 or a 9?

Came across this lovely lowball and the seller is claiming it a 79, but the wear is so great, I cant determine if its a 79 or a 78. More experienced eyes, what year do you think this? And what leads you to determine its a 9 or 8?

https://www.ebay.com/itm/275371661760?hash=item401d6e19c0:g:-VUAAOSwna5iwJeu

 

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It's a 9. The right side of the 9 is continuous.

 

I think that it's a 9 also.

 

9

 

Number 9

 

9

 

Has to be 9. The top of an 8 is very oblong.

 

Yep. Definitely a 9 in my eyes also.