To be considered Sterling, the purity must be 92.5 % Silver. That piece is clearly marked Sterling. $177. is the melt value.
If you so that piece on Ebay, it would command much more than melt value. Excellent purchase.
MineLab E-Trac, MineLab Safari, MineLab Explorer XS,
White's 5000 D, White's 6DB, White's 5000 D GEB
Sunray X-1 for the ML's, Garrett PP for the White's and a Backhoe