I have a German Stein with a metal lid that says Lowenbrau Munchen with emblem between. 0.5 l gerz on side. W. Germany on bottom. City and river on mug. I see a lot of these mugs but they all have a simple Lowenbrau lid mine is the only one I found with this lid.
There are two of them for sale on ebay right now, at $25 and $50. Watch what they go for. You can also check completed transactions. It will cost about $15 to ship. I doubt this will go for more than $20 to $25 at the most as it is a modern stein.