THanks Jimmy,
well the original Lee Valley Double square (~$51.00) was made in the USA. This square was off more when the sliding part was at one end of the rule than the other when comparing it to my other squares. A friend and I then measured the width of the slot in the rule and it was wider at one end of the 4" rule than the other (using digital caliper)
So that's when decided to return the LV ones and buy the Starrett for 2X the price (ouch!). When that was off (in the pictures I shared) I just returned that one back to Amazon.
thanks for your suggestions
'mark