Synchronous Serendipity

Sometimes life is too kind.
I have been pestering local fishermen here in Seaham (no not for THAT Phoeb! Don't believe what she says about me!!!!! ) for sea charts relating to the area.. preferably old ones. They all use GPS now - no joy there. What were the chances of going into Stromness museum on Orkney only to find not only a beautiful old sea chart but one with an exploded enlargement of the bit I needed????????
And and and it's pre 1900!