I have seen originals in good condition sell on ebay for ~$200, so if they are the correct grips, I think you did OK.
I looked at buying originals for my 1918 1911, but as I looked at the coolgun 1911 sight I learned that a number of the parts on my gun were not original, so it didn't make sense to spend $200 for orignial grips. I opted for the Hogue replica grips. I don't think mine was rearsenaled (can't find any marks), but someone must have swaped out some parts to modernize it. I have it back to where it "looks" like it did in 1918, but not with all original parts.