I am a dead set amateur at this watch stuff, but unless you can see the movement and verify its condition, serial number, cal with case back number and dial then case you could end up with literally anything from a bitsa to a completely bastardised watch, if the seller is not supplying pics of the needed details your instincts should definitely be aroused, caveat emptor. The seller may well be honest and if so will supply the pics without question if asked, I am already put off as the pics are not already included, and good pics not out of focus rubbish, pics of the item in question not copy pasted from God knows where. Best of luck, be wary and hesitant, but it's your coin.