It's not a troy pound; it's an "ordinary" pound, that is, avoirdupois. This is perhaps surprising, since the "libra fina" is used in Bolivia to quote metal prices, and troy weight is commonly used precisely for precious metals. Nevertheless, it is definitely so.

A troy ounce is 31.103 4768 grams, and a troy pound is 12 troy ounces, so a troy pound is 373.241 7216 grams.
https://en.wikipedia.org/wiki/Troy_weight#Units_of_measureme...

But there are plenty of Bolivian sources that show that a "libra fina" is 454 grams, not 373. Here's one:

"Nota: 1 Onza troy = 31,10 gramos / 1 Libra fina = 454 gramos"
http://plataformaenergetica.org/sites/default/files/CIFRAS_N...

As you can see here, they use the word "troy" when it's troy weight. 454 grams (actually about 453.6) is the equivalent of a pound avoidupois.
https://en.wikipedia.org/wiki/Avoirdupois#Post-Elizabethan_u...


--------------------------------------------------
Note added at 58 mins (2018-02-26 21:49:14 GMT)
--------------------------------------------------

You could just say "pound"; after all, in everyday life this is what we mean when we refer to a pound (weight). But since troy weight is often used for metals, I think it would be better to specify.