The numbers for 1954 were provided by Antiquorum. V&C introduced several new models in 1955 to celebrate their bicentennial, which must have occupied the design and production teams a good deal. They also split their supply of the cal. 498 between two references. The snap-back 4956 was available in two metals and is somewhat easier to find, so my guess is that more of these were produced. In view of this, it may be that the same or even less of the 4958 were made in 1955 but that is only conjecture.