I am wondering if someone can decipher these proof marks. They are on a Mannlicher-Schoenauer Model 1908 fullstock carbine in 7x57. It seems to have been rebarreled (marked ...ELLER Nr. 067". possibly the "H" is obscured under the rear sight band...so, "HELLER"?) to 7x57 and at that time was marked with German (Nazi period?) import and proofmarks . However, there also seem to be two sets of proofhouse ledger numbers (with the year of make/proof), both 1920 and 1926, and that complicates things. At least this is all how I interpret the markings.

I know that the Sequoia Importing Company in the US introduced the 1908 M-S in 7x57, rebarreled in Germany by George Knaak. But I think that was earlier than this rifle.

Can someone clarify any of this? Thanks, Rob