GilRising

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Please complete any outstanding trades with @ali187 before 24th June 2021 (so by the end of 23rd June 2021 UK forum server time), when their account will then subsequently be closed.

It might resemble a billion sovereign but all the sovereign issues in 1990 were proofs, to the best of my knowledge.

Take a look at my highly professional Gold cleaning thread 😁
 

I can’t make out from these photos what the actual issue is- but finger prints, haze, red spot and other superficial problems can be resolved. Scratches and abrasions cannot. 
I would send for professional attention or at least someone proficient or to NGC/PCGS for Conservation.
In the meantime...
 

^ yes it can be safely cleaned but unless it means something to you why bother? The cost will likely outweigh the future cleaner vakue. 1990s aren’t particularly high demand coins are they?

I think 1990 is one of those years which can be popular (and valuable) because that version of the  Queen's head is only available on proof sovereigns and the mintages are relatively low.  Don't let anyone tell you "its just bullion".
The obvious thing to do would be to get it conserved - which should deal with the copper spots.   What the spot over the horse's head is I don't know and maybe it is something they can't deal with.  But if you try to clean it off with a fingernail and scratch it then you will kill any premium value it may have.

Just had a look at the Coin Cabinet auction results from Sunday a 1990 Sovereign graded PR69 sold for £410

Hello, 
Definitely agree with comments above that you don’t try to clean it yourself. If you do really want to conserve it then then it to either PCGS or NGC and let them conserve and grade it. 
 
In term of value a 1990 sold at the Coin Cabinet auction on the weekend, it was graded by PCGS as PF69DCAM mad it made £410, lot 1990.
On Saturday I bought a 1990 ungraded coin from an Australian dealer for A$750 + A$9 delivery. Let’s about £380. 

They look like red or copper spots which really need NCS conservation. If they were finger prints or smudges they can be cleaned off yourself using organic solvents, but not to be messed with if in doubt. It is easy to drop the coin or similarly mistreat it if you're not careful.

I sold a lot of stunning proofs that would likely have got perfect grades last summer and have dozens of empty boxes and certificates to show.
Disappointingly the price I could sell for was marginal over spot or in the case of selling to HGM 97.5% of spot.
I was gutted to see that there was no value whatsoever put on proofs so just wanted to share this information.
That said this coin is nothing special so check my recent guide to cleaning a proof.
As soon as a proof has a permanent mark, or fine scratches, unless it is special, its value is bullion but someone may pay a little extra for a nicer looking coin.
Spending money on professional restoration ( I don't know the process ) plus two way shipping is unlikely to be worthwhile as you can probably purchase a replacement for less.
If selling today you might get lucky and get spot + 4% privately, a higher price on eBay but after fees and PP charges, less in your pocket.

shouldn't this be 8 x (1355-955) or £3200?
ie the amount he had to reinvest was his original amount
minus his losses?
 
HH

Another Sov to take the total to 6.