I don't know this. But if the one in the following link is original (I believe so), then the one posted by you is a reworked gun (I also believe so). The look and feel difference between yours and his is too big:
Here is the reference gun:
http://www.gunbroker.com/Auction/Vie...Item=522058721
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[Edit] Another seller has better picture showing how these numbers should look like, his picture #7 and #8 were well taken. This is probably a better reference for comparison:
http://www.gunbroker.com/Auction/Vie...Item=521508151