Looks like a W59. The ones I got were "honed" at an extremely high angle and I had to take a LOT of steel off to get down to a proper bevel. Be patent, and let the coarse grits to the heavy work for you.We don't have a great variety of straights readily available to us in the Philippines. I found this available for USD 12 + 2 shipping.
View attachment 1054033
Which GD is this? It may even be a knockoff.
A lot of info on the blade in that link I posted