It appears that it was originally built as:
Raketenjagdpanzer 2 armed with SS-11 and in service 1967 to 1983ish with 370 built.
After the HOT missile was developed, they converted 316 Raketenjagdpanzer 2's to carry it (Euromissile K3S HOT) from 1978 to 1983. The converted vehicles were redesignated JAGUAR 1. Removed from Bundeswehr service by 2005.
From 1983 to 1985, some 165 Kanone Jagdpanzer (the one with 90mm gun) were converted by removal of the 90mm gun and addition of the TOW ATGM system. Additional armor was also added. These vehicles were redesignated JAGUAR 2.
In 1989, the Jaguar 2 received the TOW 2 missile system.
In 1993, the Jaguar 2 tank destroyers were phased out in favour of the Jaguar 1A3, an upgraded version of the Jaguar 1.
While it may seem bizarre that the Jaguar 1 survived, but the Jaguar 2 didn't...a small tidbit may explain why.
The Jaguar 1's HOT missile-system was fully automatic, with a gas-proof magazine drum containing eight missiles, with 12 more missiles carried inside the vehicle.
Meanwhile, the Jaguar 2 had to manually reload the TOW missile, I think. But it had I believe a thermal sight built into the TOW launcher; which could be dismounted and fired away from the vehicle. So basically Jaguar 2 was an armored tracked TOW-Humvee.
Jaguar 1A3 added a second generation TI sight; giving the Bundeswehr a fully under armor NBC protected ATGM system with genuine night fighting capability; which is why it survived and Jaguar 2 didn't.
Jane's claims:
Quote:
Hit probability against a fixed target (2.3 × 2.3 m) or moving target (2.3 × 4.6 m) is 80 per cent at ranges of up to 500 m and almost 100 per cent at ranges between 500 and 4,000 m.
...
In 1985, the HOT 2 entered production with delivery of first production missiles in 1986 after which time production of the HOT 1 ceased. HOT 2 has its warhead diameter increased from 136 mm to 150mm and the explosive charge increased from 3 kg to 4.1 kg with no actual increase in missile weight. The HOT 2 warhead will penetrate 1,300 mm of conventional steel armour.
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Jane's also claims that the Jaguar 1's transferred to the Austrian Army got TI sights added and were converted to HOT 3.
Jane's also claims that the reason the Bundeswehr went with the Jaguar 2 when they had the Jaguar 1 was because TOW was much cheaper per missile in addition to the standard TOW launcher selected already having the AN/TAS-4 TI sight.