Do not make a second shop, and here is why... When someone finds your shop via a magnet you have listed and they say hey this is a neat magnet and they go roaming through your shop to see what other kind of magnets there are they will see...OH! you have neat vintage stuff also! if you were to link the second shop in your first shop they you are taking views away from your wonderful magnets. Let them see all you can do in one place.
