I recently bought a seamaster pro ceramic in used 80% condition no box or papers for $1700, as a tryout. i thought it would be too small but it has grown on me in the three months i have worn it. Its really a beautiful watch!! I now want to keep it permanently. My question is, should i keep the used watch (which is not in mint condition, no papers etc.)? or Should i sell it ,go all in, and buy a seamaster from an AD?