I thought some of the Forum members might enjoy seeing one from 1978 just before the start of the 3450 first series, first manufactured in 1981. One might think since it has the sapphire crystal and Sigma Swiss Sigma dial, that the case would be the same, or at least very similar to 3450, but it is not. In 3450 the bezel is wider and unlike the 3448 goes to the edge of the case. The outer edge of the lower part of the lugs has a bevel. 3450 does not - it is straight down. The 3450 appears a bit larger (most auction reviews have if at 37.5 mm compared to 37mm for 3448; although the auction reports are not consistent). In the metal, the 3450 appears a tad larger in diameter; and a tad thicker at least compared to the sapphire 3448.

