This might be a forgery, a fluke. Is there an Arsenal 56?
(https://preview.ibb.co/gb2CYU/attachment_1_1.jpg) (https://ibb.co/h1vo7p)
(https://preview.ibb.co/ct3anp/attachment_1.jpg) (https://ibb.co/jLZRtU)
Not a fluke..just a normal factory, looks to be a factory /526\
(https://clone.sks-files.com/Themes/1080/images/Arsenals/tiles2.png)