A few further thoughts on this. The Dutch .303 AP rounds I have from the 1930s (nothing as early as 1926) had red tips when they were made, but the paint has mostly come off by now, so look closely at the tip to see if there is any sign it might have been coloured at some time. They have h/s with H followed by the date, where the H is for Hirtenberger, who had a factory at Dordrecht. What the V stands for I do not know, but it would not be a Mk. No.
Also, from your photo, the annulus colour looks black, but that might not be relevant, as for most countries that made .303 the annulus varnish/paint was only there as a sealant, rather than an indication of the type of bullet, which was usually indicated by tip colour.
I will be seeing some Dutch .303 collectors next weekend, and will ask them.
In the meantime, if you want it to go to a good home...:tinysmile_shy_t: