Explaining the joke:
Часовой (Someone on clock, watching by clock) - Guardian
Часы - hours, clock

the patch https://item.taobao.com/item.htm?id=804845391802
i don't think he ever posted the art itself, but the physical patch exist

Dimas152 said:

the patch https://item.taobao.com/item.htm?id=804845391802
i don't think he ever posted the art itself, but the physical patch exist

The patch underneath the "Guardian" text is also based off a real physical one, but I don't know where it originated.

UFFR said:

The patch underneath the "Guardian" text is also based off a real physical one, but I don't know where it originated.

https://unlimitedpatchworks.com/collections/all/products/2hu-sakuya-magpul-velcro-patch