@Rorschach: Here goes with posting a pic under the new system (my 1st time)! but 1st:
1. Yup, Grobet is US-owned, but some files (can't find out which) are still made in Switzerland. The place is in the French-speaking part, in the area where all the really big-bucks hand-made watches are made, it's called Vallorbe - sound familiar?
2. Can't find the right file (as per your dimensions) in the range Grobet offers.
3. But there's this range withing the Vallorbe file range (sorry it's a very distorted scan, it comes from the big, thick paperback catalogue of a local (to me) retailer of all sorts of jewellery, etc, tools:
4. All dims are L (o/a) 160 mm; cutting L 80 mm; (handle is just like a "normal" Swiss/needle file - knurled, one piece with file); max width (as above) 5.5 mm (so about half what you're looking for) but thickness (above) 1.3 mm); shape, as above, (tapers to a fine point); cuts available 00 to 6 (above).
5. Based on above catalogue, I can buy a one off of the above for 12 Swiss Francs (about 10 quid) and 12 off for 120 Swiss - BUT PLEASE NOTE: these prices are from the above catalogue which is dated 2009!!!
6. In addition to the above, you'd have to pay Swiss VAT (9%); plus shipping/post; plus UK import duty; UK customs charges and clearance, etc.
7. I note that in post #12 above, a UK dealer called Cousins UK is quoted. I would have thought that even if they don't have the above in stock they should be able to order from Vallorbe for you (Vallorbe do not sell direct to the public).
8. Unfortunately I only have the catalogue number/s of the above from the above dealer (called bijoutil BTW), which may not help you if contacting Cousins UK, but anyway, here they are: 41457; 41450; 41450T; 41451; 41452; 41452T; 41453; 41454; 41456. (The above numbers start at cut 00 files - 41457 - and finish with cut 6 - 41456). Description is:
"NEEDLE FILES WITH ROUND HANDLE, WARDING, FLAT, POINTED".
As said, considering all the above taxes, duties,etc, I think it would make far more sense for you to either A) approach Cousins UK direct yourself, or stick with your Grobet US arrangements, especially if the above is too narrow for your needs.
Anyway, HTH, IF you want me to follow up with dealer bijoutil here (not far away in Basel, Allschwil) for a current price for example, just let me know.
P.S. Inserting the above "picture" was MUCH easier than before!!!!!!!!!!!
Cheers