Greetings! I bought one of those in 1984, took it on 3 safari's and still have it. Its one of the few guns I refuse to consider selling. These are fine guns, built on a MK X Yugoslav barrelled action, stocked in nice walnut and assembled in Manchester, England. They did make a few cosmetic changes over the years and some have different markings. Mine has the barrel band front swivel, mag release in the trigger guard and 3 leaf express sights with the 100yd fixed. Some later ones had 3 folding leaves, no barrel band swivel and a side button mag release. Earlier guns are marked Whitworth out on the barrel, you may encounter some marked Whitworth on the top of the left side rail. Mine is marked Whitworth on the top of the front receiver ring and the left side also. Red pad is marked Whitworth. Beware though that quite a few guns have a Whitworth pad but dont say Whitworth anywhere else and lack the other features. Interarms had made another series called the Whitworth American Field series. My brother had one of these in 30-06 years ago and I have never seen another. Looked just like the Express model but had different sights. Same wood style etc. They started making these in the mid 1970's and I dont think they went beyond the mid 90's in production but of that I am not sure. Mine is a B serial number and I also have a Viscount 30-06 of the same number series. BTW, mine is a verrrrry good shooter and totally reliable. If you look in my pictures you will see several shots of it in Tanzania, Botswana and Zimbabwe, my first 3 trips.