From these pics, we can confirm that it is indeed a British shilling from 1900, but for more detail than that, it needs to be in focus, which usually means the camera has to be put into some kind of "macro" mode.
Apple cameras (iPhones, iPads, etc) tend to be pretty good these days, but other brands, it depends. Some cheaper phones don't have focus control at all.
If clear, in-focus pictures are a problem, and you have a scanner, try scanning them instead. A clear scan is better than a blurry picture.
When you get some clearer pics, put them in the British coin forum, rather than "unidentified". You know that it's British, and the British folks can better comment on grade and value.
But to be true, from a coin collector's perspective, the 1900 shilling isn't a particularly rare or valuable coin.
Here's the NGC database page for it. It probably has much more sentimental value to you personally as a family heirloom than it has actual monetary value to a collector.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis