That is a true TD 1.9 pump. As Andrew said, you have a "joke" pin in that there is only a very small difference between on and off boost fueling. It is not a eco diesel though
Take the top number, it will start with 0 460 xyx xxx The y is the plunger size. 8 = 8mm, 9 = 9mm 0 = 10 mm etc. Yours should be a 9
That pump should have T30s, not flat screws holding the top cover on
Is the pin upgradeable, Well the whole pump for that matter?
If you want an all out pump, with all the tricks, send it to Giles.
If you want some more go on the cheap, check the FAQ for the "make your 1.9 a faster car"
Good to know so I need to locate the top end of a 1.6 TD pump.