It seems that roughly 30 grams of gold from a standard pocket watch can be expected. At $40 per gram for 18k gold, that would give a value of $1.2k. Platinum is supposedly 34% heavier than 18k gold, but it's worth only $27.4 per gram, so it actually comes out to being worth less at about $1.1k! So much for financing that Vingt-8....