This is what we found out from the Glenrothes Global Brand Director in London:
'Samaroli' appears to been Italian whisky merchant and independent bottler. They purchased some 1969 Glenrothes - most likely from another merchant - to bottle under their own label.
From time to time, small parcels of Glenrothes become available and they (the company) sample most, purchasing the very fine casks but by no means all. So much depends on the wood in which it is matured, and Glenrothes New Make Spirit sold from the still to a blender in 1969 may have been put by them into great wood, but also may have been in lesser quality casks. Great spirit in poor wood cannot develop into great malt. Of course all the Glenrothes bottled by the company itself (and sold in their round bottle) has matured in the very best casks.
Samaroli's Glenrothes may well also be outstanding, but it is always best to try to get a sample of a whisky before buying.