Local guy wants to trade his 5513 for my 16610. Opinions??

[chris_nor_cal]

I've seen the watch on this guy a few times and struck up conversation today about how much i liked his watch. i was halfway joking that I'd like to trade him my Z series 16610 submariner and he bit on it. I know fairly little about vintages but I'm pretty sure its a 5513. No gold surrounds, t <25, 660=200m. The dial and hands look immaculate, the crystal is scratched and it seems like it has regular wear all over. he said the bracelet was replaced and he thinks the dial and hands are original. the guy says he had it serviced in san francisco and has all the box, papers, etc. said he bought it in europe in 1972 when he was in the navy and is the original owner. I'm going to go back and get better pics this week. what do you guys think? good deal?

I apologize I know this picture is atrocious, but cell phone cameras suck, I will go back and take better pictures later with my digital camera. I would most likely have this thing serviced by rolex and polished up nicely. I'm just worried about fakes, frankenwatches, etc.