The Minx was introduced in 1978 in .22
The Jetfire was introduced in 1978 in .25acp
The 950 Jetfire was intriduced in 1994 in .25acp
The Model 20 was introduced in 1968-1969 (950b)
Nodel 21 introduced in 1985 (revised model 20) in .22
Model 21A introduced in 1984 in .22 and .25acp (replacement for model 20, 21)
...........which brings us to the Model 21 Bobcat of which there were three versions: original, nickel and EL version. Wilkipedia is incorrect. That is, unless the Book of Beretta was misprinted