different planchet to 90% silver washington 1/4 USD?

i received this coin recently but it appears roughly 1mm wider than a (90%) washington ¼, should this be the case does anyone know? thank you, Graeme

Hi! Posting pictures is very helpful, but I wouldn't be too surprised if the planchet is a bit off. A lot of high production coins had slight variations but 1 mm is a bit larger than most variations.