James I silver shilling.
The coinage issues of this reign come in three stages and the portrait style of your coin identifies it as 'third coinage' which means it was struck between 1619 and 1625. It's difficult to see the mintmark clearly in these photos (the mintmark appears on each side of the coin, in the legend, at 12 o'clock), but I'm pretty sure it is either a Lis or a Trefoil. The Lis mark was used between 1623 and 1624, the Trefoil in 1624 only.
The ID number for your coin in the Spink catalogue of English coinage is 2668.
It hasn't been clipped very much and, compared with a lot of those which turn up, the condition isn't too bad either. I'd estimate a value of around £75-£95, on a good day maybe a bit more.
Hope this helps.
Edited by Hogarth
02/10/2019 4:49 pm