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It is a bit of a process to convert the shell itself to usable material, involving heat and pressure to fuse the scutes.

Yes it is illegal to buy/sell in many countries due to CITES restrictions, often even to modify it (i.e. work it into new shapes). The laws vary by country and are more complicated than you might...

Here you go. Select Keen Kutters (early 1900s) were made with t-shell (I know because I've handled about 4 of these personally). Aside from that and the Kindalls (MK30, 31, 32 mostly) it's not seen...