Many thanks the welcome and for the prompt responses. The coins pass the
tissue test.
Very different results from my hamfisted specific gravity tests.
The heavier of the two coins (recognisable by a brown mark between the S and O of Peso)gave 10.144 and the other 8.146
Can't be right but what it does suggest is that the coins do not have the same composition. Will try again later with an improved suspension method.
Thanks again.