for the sake of future PC searches (for science!) pic shows ...
max damage, gold text Draconic Spear with inherent 15wE damage mod and 252g merch value.
I'll second Surge's assertion that it's the sort of thing you really can't hope to accurately PC ahead of time - too rare and demand/collectibility too unstable.
When I sold off mine, I asked for help/opinions first and got some reports of prices other Mauso loot had sold for, but in the end it still came down to picking reserves based on how much the stuff seemed worth
to me. What's so low an offer to justify me keeping this and using up a priceless storage space?
Here is the link to my thread from Dec. 2011 where I sold mine
(and left price history ... for science!) I would think the gold spear I sold is more relevant to yours than the gold scythe Surge mentioned.
max, gold-text, r10 Pronged Spear, inherent 15stance damage mod: Dec. 9, 2011 - 4e+96k
(124-128k value with 1e at 7-8k lately.)
I'd say yours would be worth more than that one. Both 15wE and 15stance seem roughly the same level of useful-only-in-rather-niche-builds for a spear. But Draconic is FAR more popular a spear skin than Pronged, since r9 insc. Draconics still sell pretty easily for 20k+
(I think! omg, don't use that number as more than a rough guess please!) and r9 insc. Pronged Spears are almost, if not certainly, merchfood, right?
I'm not sure if it would be reasonable to predict your spear would get as high offers as the 15^50 Hooked Scythe got. Draconic Spear is considered a sexier skin by the overall market than Hooked Scythe
(another one, like Pronged Spear, that I think is next to nil PC in r9 insc. ... though they do dye well!) but I think the usefulness of the inherent mods on these Mauso pieces is a stronger factor in price than the skin. If a buyer is interested in the skin alone, they're not shopping for Mauso loot. It's the inherent mods on these that make them notably shiny to the folks offering the most pink goo for them, right?
Grats on the snazzy new toy!
Cheers & GL
EDIT - I posted on a closed thread!

I'm sorry ... must learn to refresh pages when I start typing a reply and go afk for hours before finishing it, sorry.