About 4-4.5m long with a small 'swept back' dorsal fin
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interesting find - I used to do the webs count on the Bar so it brought back memories; I thought the Culbin Bar was a few kilometres further east and the marker you have placed is on the Nairn Bar.
All the best
Lat/Lng: 57.6142, -3.8133
OS grid ref: NH917596