Button Id help plz

[PennDirtDigger]

It has the word London on the back with another word i can’t read. The back piece moves too.

 

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[ToastedWheatie]

For a start, I believe it's the British Royal Coat of Arms .

 

[TheCannonballGuy]

ToastedWheatie is on the right track. More specifically, your button is a British Army "general service" uniform button... and even more specifically, it is the version used from 1902 to 1952. For confirmation, go here, and scroll down the page to "General Service & Named Regiments" uniform buttons:
Militarynamedregs

 

[Bigcypresshunter]

Is that called a wobble shank?

 

[Finder Bear]

Nice find, I always wonder the stories those kinds of buttons could tell!

 

[ANTIQUARIAN]

Having found a few WWI General Service buttons here in Canada, the back loop looks similar in date.
Here's a pic of the back of one of the examples I found in 2017.

The one you found looks to be on the small side, so maybe a cuff button from a uniform.
Dave

 

[Reanm8er]

Nice find beautiful condition! Congrats and best wishes!

 

[PennDirtDigger]

Thanks everyone