Insurance Values

I have been looking at Insurance for my collection.  One company is saying that their valuation of items when a claim is made is based on Sphinx -30%.   Anyone expain what Sphinx is?

It’s a catalogue isn’t it? With coin values.

Just looked on internet, there is a Spink, maybe that is what they meant.

 Agreed. With yourself being in the UK it sounds like Spink's catalogue. 

They are based in Bloomsbury, London. 

https://www.spink.com/media/view?id=19 

https://www.spink.com/ 

 Founded in the same year as the Great Fire of London in 1666 

Meet my coin insurance helga and max 

Hello

A cheaper version but works  just as well  

Oslo 😁

😁Do they put out fires?

Thanks to everybody for responding. 

Love your doggie pics.

Kebab

😁Do they put out fires?

No but they would put out the person who started it 🤣🤣