German Panzer I, 5.4 tons, crew: 2, a total of 1,900 produced before the war:
"Design of the Panzer I began in 1932 and mass production in 1934. Although intended only as a training tank to introduce the concept of armored warfare to the German Army, the Panzer I saw combat in Spain during the Spanish Civil War, in Poland, France, Soviet Union and North Africa during the Second World War, and even in China during the Second Sino-Japanese War. Based on experience gathered during the Spanish Civil War, the Panzer I helped shape the German armored corps used to invade Poland in 1939 and France in 1940."
German Panzer II, 7.2 tons, crew: 3, about 1,200 produced by 1939:
"The Panzer II was used in the German campaigns in Poland, France, the Low Countries, Denmark, Norway, North Africa and the Eastern Front. After being removed from front-line duty, it was used for training and on secondary fronts. The chassis was used for a number of self-propelled guns including the Wespe and Marder II."
Panzer 38(t) Czech built, 9.7 tons, crew: 4, about 150 available in 1939:
"The Panzer 38(t) performed well in the Polish campaign in 1939 and the Battle of France in 1940. It was much better armed than the Panzer I and Panzer II tanks. It was on par with most light tank designs of the era, although it was unable to effectively engage the frontal armour of medium, heavy and infantry tank designs."
Enough for today, need to leave something for next time. ;-)