Here is an unusual glass enameled FP in a nice blue color.
There was some paperwork to go along with this pen.
I found there are some interesting features on this pen. To see them, take a look at these close-up photos showing the cap band.
As you can see, the inscriptions found appear to be those for a sterling silver pen. It may have become a grid pattern but clearly there are lots of missing lines that should have run longitudinally down the cap and barrel to form the grid.
The intriguing item is that the cap is inscribed with STERLING SILVER. Yet a look down into the cap shows a color that leads me to believe this metal is brass instead.
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Another interesting item can be seen in these pictures of the tassies. While flat, notice that the cap tassie is very short and has only 2 rings instead of the normal 4.
This shortened tassie reminds me of the other example I found on a 3-ring Keepsake prototype, shown below to right of the production Keepsake model.
Take a look at the model in red.
Here is a similar glass enamel cap in green. Unforutnately the complete pen isn't available.
Note that the tassie on this cap has three rings, unlike the 2-ring blue cap above, which are both shortened from the normal 4 rings.
Here is another variant in a yellow color and diamond pattern.
The smaller arrowhead in the clip is consistent with the flat tassie that you see below. What is interesting, is the second notch in the cap, as if to position the clip to a location diametrically opposite. Another interesting point is this has a 3-ring tassie, not the normal 4 found on 75s.
This was definitely and engineering prototype as can be seen by the inscription "I-P-10905-L" on the capband.
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