Batch Of Spanish Reales Possibly Fake

Hi all,

This is my first post! I'm very new to the world of coins since I recently inherited a collection of 12 Spanish reales, Mexican mint dating from 1516 to 1700. They had spent decades mounted on a velvet-lined board with glue! After doing some online research I'm beginning to think some of these are forgeries. For instance, the Carlos and Johanna Column reales seem suspiciously light and flimsy and don't have the weight of silver. A few of these have a golden colour on them where the glue had been. I don't know if this is some chemical reaction between the glue and silver, or it's the glue that has revealed another cheaper metal below. Also, I've been unable to find good matches to some of them. The ½ real for instance is missing the mint that should be located to the left of the "P". The large 8 real which has a date of 1760 has a very unusual pattern I haven't seen anywhere else online.

I was planning on having these sent in for grading, in the hopes that at least some of them are authentic, but not sure if it's worth it. I'm hoping to get advice on whether these may be real or forgeries (and worth sending in for grading). My grandfather specialized in 16th/17th C Spanish antiques and I would be surprised if he had bought fakes.

If they are real (pun intended), I'm also hoping to sell them all at once, even if at a reduced cost. Where would be the best place to do this? Dealer? ebay? I have a larger collection of Mexican coins and paper money of VG-XF quality I want to sell together (reduced price if necessary). I'm reluctant to sell these off one by one since I don't have the time. Is there any dealer or auction house that specializes in Mexican/Spanish coins that would buy them outright?