Originally Posted by T. A. Gardner

On the JadgTiger: 150 were ordered, 75 were completed (want the werk numbers?). They served officially in just two panzerjäger abteilung; the 653rd and 512th. Both saw action exclusively on the Western Front, the 653rd facing the US 3rd Army for the most part and the 512th, the US 9th Army.
A few, three or four might have saw action against the Russians in the last few days of the war when the St. Valentine plant in Austria where they were being assembled was about to be overrun. Scratch crews grabbed the few finished vehicles and drove them into action. But, accounts are sketchy as to what they did.