Spiros,
There was four versions of the Beolink 5000 which I am aware of. A Mark I & II for US and a Mark I & II for everyone else.
I have never seen a US version, but you may wish to look at the four digit "Type" number
Type 1534 was a US Mark I
Type 1623 was a US Mark II
Type 1531 was a Mark I for everyone else
Type 1620 was a Mark II for everyone else