Well,
"Sharktooth Shields" have been reported only in Tactics, so far. So if this is indeed a Sharktooth Shield, I suspect it is Tactics req. The OP probably has a typo/mistake on either the name of the shield or the att. requirement.
If it is a 14/6 Strength shield other than Sharktooth, then it is probably merch food yes. Anyone who can put 6 points in strength (a Warrior) can and will probably put at least 8 or 9 and be allowed to use a max ar. shield. If it's a strength-req Sharktooth, then it might be worth something simply as a curiosity.
If it's a 14/6 Tactics Sharktooth, then I'm not positive but I'm guessing ...
for blue text, 70k+
for gold text, maybe more like 120k+
Sharktooth Shields are not the rarest low-req skin, nor are they the most common. So I think you're somewhere in the mid-range of caster shield value for 14/6 Tactics.
Those are very shaky guesses. Hopefully Amber will edit his/her OP to clarify exactly what it is and get more opinions.
Cheers & GL