Questions re 1924 Worlds Fair Medal

I have a struck nickel medal from the 1924 London World‘s Fair.  The others I’ve seen that have sold are all copper and in worse condition.

How can I find info on mine and/or get a valuation when I can’t find any comps?

I’m new to this so thank you so much for any help.  🙏

Here's one that didn't sell on ebay:

GB 1924 British Empire Exhibition medal, nickel, 28mm

https://www.ebay.com.au/itm/385829966829?mkevt=1&mkcid=1&mkrid=705-53470-19255-0&campid=5338722076&customid=&toolid=10050