This was posted while I was out of the country on travel, and I just saw it.
You have an interesting piece. The musket is a nominal .69 caliber Muster 1842 Austrian Army (k.k. Army) smoothbore musket. It was used by line and Grenz (border) infantry in the k.k. Army. The engineers used the Muster 1844 Extra Corps carbine. This example, based upon the hooked bayonet lug, was manufactured as a flintlock musket prior to 1838, and was transformed to tubelock during the subsequent production of M1842 muskets. It is one of the 25,000 M1842s that were sold in the original tubelock to MG Fremont by the the New York City firme of Kruse, Drexel, and Schmidt in 1861. Fifteen thousand of them were issued to Fremont's troops in Missouri in tubelock, and 10,000 were sent to Cincinnati to be transformed to percussion by Eagle Iron Works. This one is one of the 15,000. Approximately 8,000 surviving weapons were later sent to Henry Eichholtz Leman of Lancaster, Pennsylvania, where in 1862 they were transformed from tubelock to smoothbore percussion under contract with Frankfort Arsenal. The Prussian style breech used by Leman in the transformation is quite distinctive.
Regards,
Don Dixon