I'm trying to ID a regimental marking on a Pattern 1888 bayonet. The marking is: P.T.D. over 2.5 (possibly 3.5)

The bayonet has both Britishicon and South African ownership marks and the regimental is lined out. So, the regimental could be either British or SA.

I have searched high and low and can't find any info. Any help would be most appreciated.

Ralph
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