The instrument is more then likely in the 1000-1300 euro (1300-1700 USD) range, possibly a bit more if functional sound. I believe it would be hard to properly test without the Mutterkompass (master compass) though.
Please contact me if you are interested in selling or would like more...
That is indeed a Luftwaffe repeater compass Fl. 23334 as equipped on most German fighters such as previously mentioned. I would be interested in buying this item off you so please send me a PM (private message).