515Bs generally don't command prices above US$1200-1500. That's assuming mint pair and worldwide shipping.

Recent sales

515B S Good req recone 170 175 2011-01
515B P Good req recone 16" 650 665 2011-01
515B P Exc 1100 1110 2011-02
515B S Good req recone 225 235 2011-02
515B S Good 16" 350 355 2011-02
515B S Good 370 380 2011-02
515B S Exc 16" 450 455 2011-02
515B S Good 550 560 2011-02
515B P Exc 1250 1260 2011-03
515B P Exc 1675 1675 2011-03
515B S Good 440 445 2011-03
515B P Good req recone 855 860 2011-03
515B P Exc 1600 1600 2011-04
515B S Exc 360 360 2011-04
515B P Good req recone 395 395 2011-04
515B P Good req recone 460 460 2011-04
515B S Mint 645 645 2011-04
515B P Mint 2000 2000 2011-05
515B S Exc 700 700 2011-05
515B P Good 16" 1525 1525 2011-06
515B S Good 405 405 2011-06
515B S Good 510 510 2011-06
515B S Good 16" 510 510 2011-06
515B P Good req recone 700 700 2011-06
515B S Good 16" req recone 200 200 2011-07
515B S Good 16" 250 250 2011-07
515B S Good 335 335 2011-07
515B P Exc 800 800 2011-07
515B P Exc 1075 1075 2011-08
515B S Exc 260 260 2011-08
515B S Good 360 360 2011-08
515B S NOS 610 610 2011-08
515B P Exc 990 990 2011-08
515B P Exc 1300 1300 2011-09
515B 3 Good req recone 900 900 2011-09
515B P Mint 3000 3000 2011-10
515B P Mint 3000 3000 2011-10
515B S 16" Good 400 400 2011-10
515B S Exc 400 400 2011-10
515B P Good req recone 450 450 2011-10
515B S Exc 500 500 2011-10
515B S Good 600 600 2011-10
515B S NOS 610 610 2011-10
515B P Exc 1235 1235 2011-11