Well this shield is pretty Nice tbh, but i doubt it's worth a fortune, for a lack of potential buyers. It could interest a pvp monk player who is bored of basic skins we see a lot (conch, aegis, etc..), Or a collector. As one of them(pvp lad), i Would consider offer 5a on it, enventualy . Maybe you can reach 10a, since lot of them dont play much and dont rly care about money . This is m'y own PoV, but i'm also curious to have someone else advice
I know of 2 being sold in the last 3 months, one for 350e, the other one went for 500e. Crude is quite a common skin when it comes to blue rarity, so it's about finding a collector or somebody who has an OCD when it comes to rarities.
5a sounds fair, 10a sounds a bit of a stretch, but it's GW 2k17, when semi-rare low req shields like SWS reach crazy amounts compared to year or two years ago.