Dear Jiri;
Thank you for your most interesting request about your grand father Jaroslav Teichman, gunmaker. Thank you further for the link to the photos of your grandfather, the work shop and photos of the two guns. The photos show that the guns are a very high quality and your grandfather made guns like the ones in the photos he must be a very skilled and talented gunmaker. Where did he learn gunmaking in the Czech Republic--it is of great interest to us? I was able to translate the article text to English. However, it appears that the hammer gun was restored by your grandfather and the other double gun was built by him.
It was painful to me to read of the terrible treatment that your family endured.
I do not know anyone in Croatia that might be able to help you but I am going to suggest to you an additional route to search for the gun---that is contacting a group of engravers and wood carvers in Sopot, Bulgaria who also engrave guns and carve the wood of gunstocks. This group is led by Evgeni Dimov and I suspect that he has fellow engraver friends in Croatia that could help you in your search. if your grandfathers gun is of the quality that your photos shows will be a gun that will get the attention of many gun enthusiast, gunmakers and engravers of today.
The Czech gunmakers were some of the best in Europe and I hope that you are successful in your search. I propose to you that you contact the owner of the number 1 shotgun and ask him to allow you to take photos of the shotgun your grandfather made as well as the shotgun's action and underside of the barrels where it will be stamped with numbers and symbols so that you can send these photos to the engravers to help them help you in your search.
Here is an internet link to Evgeni Dimov:
http://www.home.dimovengraving.com/Kindest Regards;
Stephen Howell