Let's assume the exchange will be one doll for 120kk. As I don't have 120kk at the moment, I will test with coins of equivalent weight:
23:45 You see 100 gold coins. 
They weigh 10.00 oz.
23:47 You see 100 crystal coins.
They weigh 10.00 oz. 
Assuming that the doll you are going to trade costs 120kk, we will need 4 Zaoan Chess (32kk each). Considering that the chess are in your depot and doing the test, the following message appears: "You can only trade up to 100 objects at one team." In this case, the limit of 100 items per trade was exceeded. We see that the biggest detail of this negotiation is the issue of the quantity of items. Also remembering that the 4 chess count as items, you would be able to trade:
1) With a bunch of 96 coins, totaling 96kk
2) Don't forget to equip a backpack in your set to receive the doll
3) Remember to have the ability to receive the doll (in the case of the nightmare doll: 18 oz)

