Thanks for all the feedback so far.
The prototype has a 6" blade and the overall length is about 12 inches. It would be possible to make a smaller Kirpan but it depends on the feedback we get.
It would be very hard to find a high quality knife manufacturer that could produce a Kirpan with an Iron blade. Iron is just not used any more as a modern blade material, Steel has many advantages over Iron as a blade material, it does not stain, corrode or rust as easily as Iron. Steel will also take a much better edge than Iron and it will hold it much longer.
Steel is basically a refined version of Iron. Alloys such as Carbon, Chromium, Vanadium and Molybdenum are added to increase the toughness, wear resistance and corrosion resistance. The presence of the carbon makes the steel stronger and harder than pure iron.
Thanks,
Kam