IMO,
It's one of the better repro stamps, but not correct.
Compare the Flame to the link provided by MPD1978.

Here are 2 more repro stamps,.

Underwood Bavarian Carbine
Underwood Bavarian Carbine

Not after you Czechicon, I'd of bought for that kinda $$ also, you did very well.
Someone re-stamped it to add value.
You can tell by the Buttplate over hang and slight trigger housing reveal that its been sanded hard

Gotta run guys..
Regards,
Charlie-painter777