This design is also called a staurogram or monogrammatic cross.  It dates back to an early manuscript from the second century when the Greek letters T & P were superimposed over each other and used in the early Greek New Testament (175-225 AD) as a symbol of Christ's crucifixion.  It was later used on a coin struck in Constantinople between 507-518.

Weight: 16.9 grams

Size: 7 inches