authentification Authenticity thoughts on this 1745 LIMA Half Crown?

[Halfcrowned]

I purchased this 1745 George II LIMA half crown on eBay for £170 and have been looking into its authenticity. The coin measures 33.24mm on the 12 to 6 axis and 34.54mm on the 9 to 3 axis, meaning a slightly oval flan. Thickness is 1.98mm and weight is 14.94 grams. I recently measured a second LIMA half crown in person, which measures almost identically  (33.50mm from 12 to 6 and 34.32mm from 9 to 3) suggesting the oval may be a characteristic of this type (?).

Under loupe examination, the reverse fields show what appears to be a genuine aged surface, with scarred pitting, micro abrasions, and contact marks across the surface. Edge inscription is legible throughout and doesn’t show any clear evidence of fillings or any seams. I don't have access to a silver tester, but I am fairly certain it is silver.

The main discussion points I've had are the sharpness and the relief, particularly of the reverse, along with the slight reddish coloration (though I think my photos overstate this) and overall large-ish and oval diameter.

I’m happy to provide any additional photos or closeups. Authentic or not, what do you guys think? 

Edited 52 minutes ago by Halfcrowned
Photo did not attach previously

[Chris Perkins]

Is this not the same subject matter as here: 

 

[Martinminerva]

4 minutes ago, Chris Perkins said:

Is this not the same subject matter as here: 

Yes. And yes too for authenticity, I believe...

[Halfcrowned]

2 minutes ago, Chris Perkins said:

Is this not the same subject matter as here: 

 

Largely, but I've added details, measurements, and further context from my research into the coin, so its not quite the same. If posting more than one post on a single topic matter isn't allowed I apologise - I wasn't aware

[Peckris 2]

2 minutes ago, Halfcrowned said:

Largely, but I've added details, measurements, and further context from my research into the coin, so its not quite the same. If posting more than one post on a single topic matter isn't allowed I apologise - I wasn't aware

It's allowed but it would make far more senses to add to your previous post to save this kind of confusion.