Commerical vs. military Lugers - how to tell

[gunsrfun1]

Hello â?? Being new to Lugers, I am confused by what is the difference between a â??commercialâ?� vs. â??militaryâ?� Luger. Is it that certain manufacturers (e.g., Mauser) only made one type or the other? Or is it demarcated by year (e.g, after 19xx, they are all considered military or commercial). When I see a Luger for sale, how do I know if itâ??s a commercial or military -- and as a newbie scoping out my first Luger, should I care? thanks