In case you've somehow missed it, I really enjoy the Far Away Land RPG. It's the perfect mixture of old school sensibilities, humor, atmospheric art and surprising depth. Pawns and Knights is a Pay What You Want priced adventure for Far Away Land. The sixth in the series, it may very well be the best of the lot.
It's an urban adventure / mini campaign. Like all of the FAL releases, it is open ended and sandboxie in nature. What's not to like?
Scrub the stats and it's easy enough to convert (or at least steal ideas for) OSR games of your choice.
From the blurb:
Dirty balbergulbs. Pawn shops. Gangs. Cow steed races and gambling. The grimy city of Londol. Rival crime bosses. Noknil. One-eyed giants who want revenge. Get ready for Pawns and Knights, a mini-campaign setting where your PCs work in a pawn shop for a greedy balbergulb boss who has no regard for the law. This adventure has a plethora of mini-adventure scenarios and ideas centered around the Pawns and Knights pawn shop in the city of Londol.