Apologies, my mistake. I answered too quickly without checking properly. I checked again and my one is fat font as well - it’s not so much fat as more spread out - the edge of the Heuer shield is at the middle of the first and last A in Autavia, whereas in the “thin” font the edge of the Heuer shield is at the right hand edge of the first A and the left edge of the last A. BTW I have an Arabic numerals KAF 11063 which is also ‘fat font’, interestingly...

This “thin” font on the Phillips one is not the same as most 11630s - I think it was a transitional font that could have been used in both the end of the 11630s and the start of the 11063 series. So I think it is not definitely an issue... maybe ok?

Having said that I stand by what I said about the engraving on the back; all the other IDF 11063s I have seen have a very distinctive engraving where you can see the spiral made by the engraving tool throughout the stroke - on the Phillips one it is not obvious, but maybe it’s photo resolution issue as the JPG compression can mess up repeated details like that.

Sorry no pics, I need to find a Flickr alternative....