1887 UK 2 pound sovereign diameter

I have purchased a 1887, 2 pound sovereign KM#768 from a local jeweler who deals in coins. The coin's diameter is 29.3mm [all references that I have found are that it should be 28.4mm] It's weight is correct [15.98g] and thickness is fine at 1.8mm. I have been back to the jeweler who said it is common for coins to be slightly different in size and he assured me it is genuine.

I note there are two similar coins on Ebay with the same 29.3mm diameter. Is it normal for a coin to be slightly larger than the reference or is this a fake/counterfeit coin?

Welcome to Numista
you should compare all details with known genuine coins
Please add some pictures
http://goldsovereignexpert.com/info/fake-gold-sovereigns-spotting-counterfeits/

https://www.google.com/search?ei=JV2nXPmeGoLHwQLw4YDICQ&q=1887+sovereign+forgery&oq=1887+sovereign+forgery

Have up loaded pictures

wooow, very fine details.
Compare here:
https://goldsovereignexpert.com/year.asp

Send your picture to that site, and ask for information please:
https://goldsovereignexpert.com/
https://www.facebook.com/goldtradersuk/

Thank you for your advice. I have emailed the experts who have replied: "If you are dealing with a reputable dealer there really is no reason to question".. Unfortunate he hasn't directly answered my original question. Can a coin from a die be a non-standard diameter? I will have to take from his answer that they can.

Again Thank you for all your help

Michael

Thanks for your advice. I finally got an answer from an expert at worldpress@golddealer.com. Evidently coins can vary in both diameter and depth.