Use this and it will track and change automatically. I set at 100 but you can change to whatever fiat value you want.

Price set at $100.  

Price set at $100.  

Nice collection! You are making me warm to sell mine here as well

Not necessarily, but unless we're talking about precious metals at spot price, the value of physical goods can be subjective.  Collectibles are a prime example; not everyone has the means, knowledge, or time to sell collectibles for their highest potential value.  So the lender may choose to apply a much lower value to the collectibles if they are used as collateral.  In the event the borrower defaults on the loan the lender can sell them for below top-tier pricing, and is likely to recover his losses much sooner.

Each lender has his policies, some won't accept physical collateral at all.  It's also worth noting that this is a global forum.  The locations of the lender and borrower might make physical collateral impractical.

In your case, since you've already indicated your intent to sell your collectibles, no one is likely to accept them as collateral for a loan.  The rational is that since you've already attempted to sell them, you are very likely to take the loan and abandon the collateral with the lender.

This link don't work 

Royal Mint Outbreak of WW1 £20 silver coin x 3 0.004BTC each 0.012BTC for the 3
https://imgur.com/gallery/EIr2cvV