hi-not everything I buy I resell. My dad bought stuff just to admire-look at - collect. Some things we've paid 2-3x their value just cause its so scarce. Never bought blank certifs...so no knowledge there. But an old Daytona box-in decent shape..from the 70's-cost new $50. Now-used $450+.just for the empty box..Patek boxes-have paid over $1k for one...just to sit it on my nightstand... | 
