My favorite the night I went was a Vietnam vintage US Army Jeep - I s**t you not. Alongside that, motorbikes, lots of them, and all classics and all for sale, although a little English language note on the Thai language signage usual says, "No book"! Lambrettas, Vespas, Harley's - it just depends what is on offer on the night you go! Away from the hardware things get even more weird - 60's "kitsch" furniture - the only thing that is missing is one of those lights that float oil! Also, classic advertising… posters advertising the very first Rover motor car!
If you are a DJ the vinyl might be of interest, although most of the records on sale seem to be classics… Bach, Beethoven… that sort of stuff… (Go on - admit it, you nearly asked "How did they get them?" right?) There is also a huge selection of Buddhist amulets and a lot of people taking them very seriously, too. And of course, there's the usual array of weapons that seem to be mandatory at markets - Kung Fu stars, samurai swords, and few more practical weapons like baseball bats. There's a bit of street food on offer, and you can even get yourself a couple of cheap cocktails. Also, cheap bottles of whisky, obviously straight off a plane!
This is not a momentous affair, but it is pretty interesting… and if you wander up there you are likely to be the only foreigners and, who knows, you might even get to know a local who isn't serving you with a beer or a plate of food. The market starts at 19:00 but best turn up around 21:30. To get there you need to go a few stops north. Get out at Ractadaphisek MRT Station and go to the exit that leads to 'Panyasap School'. Facing the road, turn left and walk about 300 meters - you'll see the market on your left. Give it a shot - a genuine slice of Thailand.