British 105mm Tank Proof Projectile

[Vasco Da Gama]

Pictured is what I think is a proof projectile for the British post WW2 105mm tank gun. I think some of the white stencil letters are missing, here is my interpretation:
105mm TK
Proof
REP
APDS

Happy to be educated but my thoughts are proof replicating the service APDS round. Overall length is 248mm, with main body colour being very dark green. Pictured for comparison against the APDS projectile.

 

[MINENAZ16]

Hello,

Another one here : http://www.bocn.co.uk/vbforum/threads/91531-105mm-Tank-Proj