Help ID maker of huge film cap, 50mm x 35mm x 24mm -- AD 256K 250V MP
Who makes it? Most likely a company called XN QJALYCY

Here is a cap with an AD marking on it also, they say the brand name is XN QJALYCY, which won't help you much unless you know what the chinese equivalent for it is. 


Source: https://www.aliexpress.com/item/32380263065.html