Unlike my other 5 pounds coins, this piece has matte surfaces. The weight seems ok - 39.94g. I found a similar coin sold in UK: https://www.londoncoins.co.uk/?page=Pastresults&auc=125&searchlot=1159&searchtype=2 Any opinion what is it (tooled or something else)?
Looks like an ordinary currency piece - some just come that way & not really matte in the proof sense.
Looks like a bullion 5 pounds (quintuple sovereign) issue to me. It is equivalent to 5 sovereigns and should weigh exactly 39.90 grams (7.98 X 5) and contain 1.1775 oz of pure gold. Has several edge knocks at approx. 2, 7 and 9 o'clock and a deep scratch on the reverse. If it is an original issue you will probably get slightly above spot. After factoring in the cost of selling through an auction house or eBay, probably better to just sell it at bullion less 3-5%. That's what I would do if I wanted to use the cash elsewhere.
Again, this does not to me have the appearance of a proof, even looking at the recesses between the letters and the devices. Although it is but a photo and not seen in hand, this IMO is definitely NOT a proof specimen.