I'm not familiar with "J. Saml" and might be a maker or merchant from Budweis( http://en.wikipedia.org/wiki/%C4%8Cesk%C3%A9_Bud%C4%9Bjovice ). You are correct in that the Austro-Hungarian Empire began its proof testing in January, 1892 near the time of the Germans. I was just curious where he might have sourced his barrels and if there were any maker's mark. If you would, check the inside of the lockplate and see if there's a "N".

Kind Regards,

Raimey
rse