Howdy, long time lurker first time poster. I recently have been chasing a Seiko Diver Kinetic 200m watch and managed to find one on gumtree (I live in Perth) (REDUCEDTO $250 SEIKO MENS KINETIC DIVE 200M DIVER WATCH | Watches | Gumtree Australia Stirling Area - Dianella). I drove around to the sellers house and had a look at that and a few other watches he had for sale (mostly Seiko). After seeing the same watch at a shop for $700, I've become a little questioning towards the authenticity of his watches. He said he had a friend in Singapore that sends him the watches for a cheap price and he merely sells them to make a small profit for hobby purposes. Some of the watches had boxes, others didn't. The one I was after had no box, no book and obviously no warranty. The hand movement was jumpy because he said it hadn't been worn much and naturally the kinetic battery hadn't been charged. Should alarm bells be ringing or this is a safe sale? I understand this may be hard to tackle without having a photo of his actual watch but I thought I would try my luck here. I would really appreciate any help, thanks.