Interesting!
Sdh600, thank you for sharing the additional interesting photos! Your pistol grip cap shown is also unlike any that I have seen on FN produced stocks. (DK: it would be interesting if you do have a similar cap related to a Herter's firm product!) Yet still more for the reasons which I originally stated, I believe that your quite nice stock is not an FN product. Otherwise, your rifle appears entirely correct given the unusual nomenclature. It is also more typical FN in the bright work of the bolt assembly than mine. My FI rifle bolt parts are blued although the rifle in all respects appears un-refinished. Possibly the later series-production suggested by the serial number of mine (compared to your early number) may reflect an FI bluing design change, perhaps to further differentiate it from its ‘pure FN’ brethren.
In answer to your question, my FI rifle does not have the typical “FN” logo butt plate. I would have considered such an indicator of an aftermarket stock but for extrinsic information. I had earlier acquired a ‘normal’ FN rifle with the same style stock and butt plate as the FI model. This FN came to me ostensibly in the same configuration (excepting the Lyman 48 receiver sight) as when purchased new through an American military gun club in Germans by a serving officer. IF correct, it would seem that the stock is more likely an FN product. Yet I remain uncomfortable with this conclusion based on what seems rather crude styling atypical of FN sporting mausers. (Absent the referenced hearsay, I would suspect that the FI rifles were imported as barreled nations, being stocked and marketed by FI stateside.)
For general information, the referenced FN marked rifle of comparison to my FI is in 257 Roberts chambering, shows a 1951 production date and is in the 11xxx serial range. (This serial coincides with mainstream FN production date correlation of the period.)
Below, three left photos photos reflecting additional views of my FI rifle and three photos for comparison of the referenced FN marked counterpart.
In conclusion, I apologise to readers here who may find all of this simply trivia and no more than ‘angels on the pin head’, but for me it is satisfying to view a similar specimen and to compare/contrast what I consider a quite unusual FN product shrouded in a bit of mystery.
My take