As I recall and please forgive me but it was 50 plus years ago and memories are bit hazy about some specific details. The 720's were made specifically for the US and had 3" chambers .Thats 3" standard not 3" magnum .These would all be with 26" barrels which at the time every one wanted .
The 728's had 25" barrels with engine turned flat ribs .
Engraving did vary as W&S had to out source some of this as the engraving shop did not have the capacity to fill the order for the contract completion date as the original initial order was for all the guns to be delivered as one shipment .
The rest of that saga is another thing altogether .
Few Americans buying a gun that was marked for 3” ammunition would realize that it might not necessarily be magnum proofed.
From what I’ve seen, you are mostly wasting your time trying to tell them that fact, as well. You would have to go back many years to reference an American ammunition that was loaded to non magnum specification in a 3” hull.
Thank you, Graham.
Best,
Ted
