I'm confident F. Jaeger had a catalogue or two. That stick of firewood on the end must have been a customer's whims. But I'd contact Dietrich Apel as this history is his passion. Or I'll gladly send him a communiqué if you so desire.

http://www.germanhuntingguns.com/archives/archive-jaeger-franz/

Cheers,

Raimey
rse