Need someone who lives in thailand to check local coin shops

i looking for old silver thai coins (such as 1 baht coins from the 1800s and early 1900s and so on) and so i need a native thai person who lives in thailand, preferably bangkok, to find some reputable coin shops or people that sell genuine old thai silver coins, that are not fakes. i would also like to get some photos of some of the coins and their prices. the shops should have a good reputation as selling genuine coins, not fakes. i woud also like to know if they sell only ungraded coins or professionally graded coins, which are in plastic coin holders called slabs, which are plastic coin holders with a grade marked on them.
so i would like :
1. identify good trustworthy coin shops or coin sellers that sell old thai coins (only thai sellers)
2. get pics of some of the silver coins and their prices
3. ask if the shop has professionally graded coins as well as ungraded coins

so that you are not inconvenienced, and to keep your costs low, over the next month or so, you be able to find some coin shops as per the job description, go there if you are in the area anyway, and find the required items as per the job description and phtograph them and get their prices. or not only shops, if you can find them from other ways too thats ok, but the important thing is that they must be genuine coins, not fake, as there are many fake coins these days that are made in china