Thanks Chris,
This Seiko 5106 is relatively rare as its only made for a few years and later change another model 5146. Seiko Presmatic model is for US market only in the 50's with a selected dials and hands and like Lexus in the beginning. There is also a JDM Seiko Presmatic model but is known as Seikomatic-P.
Its hard to come by in this condition, i totally amazed with the dial and condition when i got it 2 years back.