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20x93R Help

I've got such a case that's marked in ink on the side:
TP-T 20/90
M649
LOT1 MCR-90

I don't think it's called an observation round, but rather a TP-T subcal-round. If someone knows for which (90mm?) gun?

Greetz
 
looks indeed like the 90mm subcal.

I've found one pictured here: http://armscom.net/products/td_20_90_m640_series

also on the a thread here: http://www.bocn.co.uk/vbforum/threads/77482-20mm-Subcalibers?p=174485&viewfull=1#post174485

in an old Jane's i've found this:

Training devices MECAR SA produces a special subcalibre training device for use with the 90 mm Cockerill Mk II and III
guns, known as the TD-20-90 M640. It consists of a one-piece training device resembling a complete 90 mm round with a 20 mm
12-groove right-hand twist barrel running along the centre length of the device. A special 20 mm Target Practice round, the
TP-20-90 M634, is hand loaded into a breech in the base of the device which is loaded and fired as if it were a conventional piece
of 90 mm ammunition. The 20 mm projectile can be fired to normal combat ranges.
The TP-20-90 round is 185 mm long and weighs 190 g. It has a tracer which burns for 4 seconds.
 
Thank you all, for your information, you are a champion orpheus72 .... :)
regards
 
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