I went through this for a number of years. There are no repro grips that perfectly duplicate the early WWI walnut grips. Some come close, but anything new just doesn't look aged, or realistically worn. Cylinder & Slide was having some made and offered them for a few years, but I do not see them lately. Herrett's comes close with (if you specify) a DARK black walnut. Hogue's have a similar pattern but look too new. I'm sure someone could do it, maybe the supplier to Turnbull, but they would charge over $100, maybe even $150 for a pair. You can find the originals, in slightly worn shape on ebay occasionally for $90-$150 (that is your best bet for the best "look"), and near new originals have gone for over $200, bought, I'm sure, to restore a $2000 - $4000 gun.