Some of the arsenals/depots were good about marking their rebuilds while others were. You probably see more Augusta Arsenal, AA, and Rock Island Arsenal, RIA, rebuilds than anything else. Some arsenal marks are seen occasionally, and some not at all.
If the rebuilt pistol still has the DCM paperwork identifying it, it will bring a premium over a pistol that does not. As mentioned in the previous post, price the pistol as just another refinished pistol if there is no indication of a military rebuild.