Germany and the Austro-Hungarian Empire required proof starting in 1891. Thereafter, whether for domestic sale or export, proof, and proof marks were mandatory. I don't know the rules for unfinished actions for export.
Lindner Daly Model 125 manufactured c. 1900
Winter 2005 DGJ "Ghost or Gunmaker - The Mystery of H.A. Lindner - Part II"
Imprints such as Prussia, Thuringia and Saxony on the water tables and barrel flats on many guns indicate that they were destined for the United States as their final destination. The U.S. Trade Laws prior to 1891 had no requirement that a country of origin be marked on product or merchandise. The Law was amended in 1891 to say that the name of the country of origin be imprinted. We therefore see Thuringia, Italy, Nippon and the like on guns of the period and up to 1921. This Trade Law was again amended in 1921 to read that the imprint must state , "Made in Country of Origin". We see, then, Made in England, Made in Italy, etc.