These are bog-standard LaScalas (which isn't necessarily a bad thing). If they're in good shape, $1k is certainly a reasonable price. On the other hand, I saw a pair on CL in Seattle recently that went for $500 (which was a steal).
Spartanmanor is correct - they use more-or-less the same drivers (tweeter, squawker, woofer) as the K-horn, but are tuned differently. However, like the K-horn, they are also fully horn-loaded.
-D