My turn at 507001
5 sightings.
230008.
507001 and 507018.
508104.
777018.
6 sightings.
507001, 507004, 507018 and 507030.
508104 and 508131.
8 sightings.
507001, 507004 and 507030.
508104, 508120, 508131 and 508136.
2 sightings.
507002.
508108.
4 sightings.
156467 and 156509.
390155 and 390157.
57307.
66434.
68031.
88004 and 88008.
156432 and 156433.
507011, 507013 and 507023.
777026.
507007, 507013, 507017 and 507031.
3 sightings.
507007, 507011 and 507029.
507030.
777001 and 777005.
507018.
508136.
1 sighting.
769424.
507002 and 507014.
777024 and 777152.
150101.
156408, 156418 and 156424.
507014 and 507023.
319367 and 319381.
331103.
390121, 390155 and 390157.