Here is yet another prototype of the titanium 75! (See others at #15, #25, #29 and #39).
What makes this one different can be seen in three things:
Tassie has only three stacked rings instead of
the normal four. This
is similar to the one found on a Keepsake prototype.
Accompanied by the normal T-1 style barrel end plastic jewel.
Even the 14K US nib is unmarked as to its size.
The weight of the cap and barrel are 4.9 and 5.3 grams, respectively, for a total of 10.2 grams.