Good morning again Karl,
Silly me
! I should have stopped digging at lunch time when I began to doubt where I was heading from a quick goggle, but work beckoned!!
So looking again, it must be the 130's planned successor, the
Martin M-156 aka
SP-30 known variously as the "Russian Clipper", "Moscow Clipper", or "Soviet Clipper", rejected by Pan Am and bought by Aeroflot!