Roy,
Nice find. It looks to be a mix of round edge and square edge both. I have found in all the inlaid chips I have turned up from Beverly Hills, and the Latin Quarter in Northern Kentucky, they always used the square edge chips.They used a combination of different shapes, as well as letters. I am trying to put together a set of square edge "B" chips for my roulette table, going to start with 200 of each color. I am in need of the following colors if you had any extras you want to sell: 5 white, 24 red, 70 blue, 200 brown, and 200 black.