Thanks in advance for your qualified comments. I found a 1951 Florin today with my trusty metal detector and I also found a 1958 Sixpence a bit worse for wear last week. I hope to find more Silvers as you do wondering what if any premium might be around (yes I know that condition is everything) or are they just destined to be scrapped. I am not worried about the rare dates just you normal circulated 50% Silvers. Thanks again.
Not sure what the rare dates are, but if it is in condition that says I've been burried in dirt for fifty years, have thick ugly black tarnish plus nicked all over than spot only, likely less than spot. Because who wants to buy two battered predecimals at spot when much better conditions are available at spot. From what I've seen in for sale generally (small lots) only crowns in around average condition and other pre-decimals coins in better than average (a lot better in most cases) attracts a premium around 2%, though most go for spot. If it is only one or two florins or six pence I've actually seen it go for well under spot if people buy roll of premium coins etc Also postage is a killer normal but for the two coins you have, you would try to post in a letter I presume. Hope that helps
Obviously there are scrap buyers too but few wants to pay spot especially 50% coins. Note: I've bought scrap quality coins in the past, some of it was decent or better quality but I only paid below spot.
You never know what your going to find Brexitbaby, don't give up, the fun is in the hunt. I have found over 300 silver coins in the last few years, some scarce and rare dates. The best thing about silver is it can stay in really good condition under the soil. example Source: I haven't tried selling any, so I can't say anything about premiums on post 1945 (50% silver) coins.
If you go back to basics, a 999 coin is always worth spot, regardless of condition, mintage, capsule, milk spots, tarnish, etc. Any premium, in purchase or sale is outside of its silver value and varies on a myriad of factors. 925 and 50 percentage predecimal coins would need be melted and refined to reach 999 standard so that is an expense to be deducted from spot.