This prototype of a titanium 75 obviously was not cared for very well as you can readily see with the dings on the barrel and cap. While the barrel end has a flat red jewel implying that this is the same barrel as used by the T-1, what does make this prototype interesting is the cap tassie -- it has a rounded red jewel.
This end jewel reminds me of the ones placed on the Custom Laque series made in France. Of course, this one pre-dated those French 75s by about two decades.
Other Titanium 75 FP prototypes are #15, #29 , #38, and #39.