NEW OLD STOCK slim fit clear silicone Sacs, (diameter of 5.0mm or 3/16" inch in the widest portion). 

It's around 5.0mm in diameter and 60mm in length. 

This is considered a slim sac, it will fit a wide range of popular waterman 1/2 lever-filling and button-filling pens. Such as Waterman 52 1/2, Waterman 0752 1/2, Waterman 452 1/2, etc. Slim fit Sacs are hard to find, this sac will fit the waterman 1/2 slim versions, I have tried. These are vintage production in excellent conditions with no deuteriation, limited stock available. 

As for waterman V (Vest pocket), you need to check if the barrel is long enough to accommodate the sac, you may trim the sac if you find this too long. 

NOTE: Sacs opening is very flexible to fit into different size of nipples. Please make sure that your barrel will be wide enough to accommodate this sac. Typically barrel with internal opening wider than 6.5mm will accommodate without any issues. 

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