This is a fine 1960s solid silver bracelet.
It is hinged and opens wide to allow you to pop in your wrist.
The clasp operated with a fan-shaped push button to the outside - and this releases the slide in catch fitment to open and push in to close. There is a safety chain on the bangle.
Both sides of the exterior are covered with a stylized floral pattern.
It has approximately 23 grams of silver in it.
This bracelet will fit snuggly on my wrist - I have measured the circumference of my wrist - which is 7 1/2 inches. So I would say a really good fit would be if your wrist measured 7 inches to 7 1/2 inches. I would not recommend it fitting if around your wrist is more than 7 1/2 inches.
I have photographed the hallmark for you on close-up - it has a Birmingham hallmark and the date letter T (for 1968). The maker's mark is for Joseph Smith & Sons - based in Vittoria Street in Birmingham - and noted for these type of bracelets and also lockets.
A nice vintage piece of silver jewellery. It does not come with a box, just as photographed.