Easy does the negativity
Just a little less harsh, as I got caught on a Ricoh that was rebranded SEIKO. Only paid five dollars for it at a flea market. Interestingly the serial number for the fake seiko I had came up on a Google search as a repeat. First sign of a fake. Similar to the faked 6138-7010 sliderule watches, Google "6138-7010 fake". Good news, your serial number does not come up on a search. Do a Google search of Seiko 6309, your dial style does not come up either.
Now to yours:
Dial: I would agree on the dial, which is a poor remake at best, but still, if you like it. But think about it, luminous dial, luminous sweep second and non-luminous hour and minute hands. Change the hands for a set of lumed seiko ones. Lots of aftermarket hands on eBay.
Movement: always liked the 6309 for robustness and build. Not the prettiest but worth a continued service life. Yours looks real.
Case: again, looks real, serial number does not Google as fake but has absolute signs of a major resurfacing with polishing wheel and sandpaper. Having been to India a few times, and looking on eBay for similar climatically acclimated seikos, these watches got HEAVY use in a damp, humid environment. So over polishing the case back is pretty normal. The main body is also very polished and is missing some of the edges it would have had prior to the polish.
Now, nice watch, bit gaudy on the dial for my liking. But that can be fixed with a donor dial. Needs luminous hands though to match the dial.
I have been to Hong Kong, Shanghai and Beijing and you can find stalls at all the markets where "watchmakers" change batteries, poke around in manual wind watches and cobble together from a parts box a "new" watch. Some sell on eBay.
best regards and enjoy the watch,
Geoff
PS. For fake seiko article check out the following:
http://quartzimodo.com/how-to-spot-a-fake-seiko-watch/