HI Manish
The Railmaster looks nice ! . You come across a lot of excellent Omega items in your country. I can tell you in the USA ... its slim pickings in comparison to what you have turned up (( and I bet you have more then your postings !! ). Its kind of sad the USA is void in vintage Omega "stuff" when you compare it to what people find in other countries. I think a big reason was that Norman Morris was the exclusive distributor of Omega watches in the USA and they created their own marking materials for the USA. I never find Swiss made marketing material for the US market.
Good Hunting
Bill Sohne