Johann Samuel Springer died in 1875 but the business carried on thereafter. Raimey will know the details.
Current
https://connecticutshotgun.co/galazan-gazette/christian-johann-springer/
Looks like a sideplated boxlock with a lettre annale 'q' for 1938
65 mm chambers
Tubes by Delcour Dupont (Crowned D) using quality steel from Cockerill
Are there no maker's initials on the action flats or further forward on the barrels?