My Japanese Art Collection: Doshin

A few months ago I purchased the below print from an E-bay auction. I bought it solely because the print depicts doshin (police officers), even though the seller had no information regarding who the artist was, when it was printed, or the story it relates to.

So far I know this much; there is no artist signature or publishers seal anywhere on the print, not even a watermark. It also appears that this print was part of a bound book, since there are holes along one side of it. The print also lacks a certain attention to detail, making me believe it is fairly modern piece of work.

Other than that I have not been able to find anything else. Hopefully, someone out there who sees this will be able to tell me more. Any help will be appreciated.