Sterling silver sketch pencil... no brand marking, but was 3rd party product branded. Can anyone here ID it?

[MYU]

I managed to acquire this very peculiar design sketch pencil, which had been accidentally labeled as a pen when sold. Someone had put a D1 refill inside it... which actually worked. But clearly, the clutch is of the pencil variety.

 

It was badly tarnished, but cleaned up nicely. It could use a good buffing to take out some light surface scratches. The "bullet" shape is magnificent. What's really quite interesting is the clip. It's spring loaded and you pull down on it to release the clutch. Very heavy! I'm guessing it's not completely solid silver and that it must have a metal alloy core. But there's no apparent way to disassemble it. There's a seam, showing that there's two "halves" but it's bonded together.

 

The other curiosity is that this pencil is branded for a pharmaceutical product by Bristol Myers Squibb--PLAVIX. It's engraved in precisely the font and design for that product, which even includes the 3 rows of dots to the left of the "I". Now obviously BMS didn't make this pencil. I'm guessing it was purchased from a luxury gift house that made a provision for engraving. But this is obviously not your typical kind of engraving (like an employee name), given the complexity. 

Photo before the pencil was cleaned up:

 

If anyone here is familiar with this particular pencil or may have an idea of what company gift supplier may have produced it, please let me know. Thanks!